If your Amazon marketing strategy still looks like it did a year or two ago, you’re not alone, but it may be time for a refresh.
Amazon’s algorithm has evolved. What used to work- heavy keyword focus and relying mostly on Amazon Ads – is no longer the full picture. Today, success on Amazon seems to come from something more holistic: clear positioning, strong conversion, and signals that real readers are genuinely interested in your book. The encouraging part? This shift actually plays to authors’ strengths. Instead of trying to “game” the system, you’re rewarded for doing the fundamentals well: writing a clear, compelling listing, understanding your audience, and getting your book in front of the right readers, both on and off Amazon.
In this guide, we’ll walk through what’s changed, what still matters, and how to make your book more discoverable in today’s marketplace.
TL;DR: How to Optimize for the new Amazon Algorithm (A10)
If you only do five things, do these:
- Write a clear, natural-language title and subtitle that tell Amazon and readers what your book is about.
- Update your book description so it includes genre, tropes, audience fit, and reader outcomes, not just vague sales copy.
- Treat A+ Content, the enhanced visual section of your Amazon listing, like a conversion tool, not a nice-to-have. Amazon says it can increase sales, and sellers commonly cite lifts in the high single digits.
- Fill your KDP keyword boxes strategically, using semantic phrases and intent-rich terms rather than repeated words.
- Send qualified external traffic from your newsletter, social media, and promo sites to your Amazon listings.
The big idea: Amazon is getting better at matching books to reader intent, not just matching books to exact keywords.
Table of Contents
- What is the A10 Algorithm, Really?
- How Does Amazon KDP Work in the A10 Era?
- What Should You Change on Your KDP Book Listing First?
- How Should You Use KDP Keywords Now?
- Why Does External Traffic Matter More?
- What Reviews Tell Amazon Beyond Star Ratings
- A Mini Case Study: Optimizing One Nonfiction KDP Book
- Your 90-Day A10 Optimization Checklist
- FAQ
What is the A10 Algorithm, Really?
Let’s start with an important caveat: Amazon does not publicly publish a detailed books-specific A10 ranking formula.
But there is enough evidence to make one thing clear: Amazon’s search and recommendation systems have become more semantic and behavior-driven. Amazon Science has published research on semantic matching in product search, and the company’s broader commerce AI work, including COSMO, points to stronger modeling of relationships between products, intents, and concepts.
In plain English, that means Amazon is better at understanding things like:
- What a shopper is actually trying to buy
- What kind of book a listing appears to be
- Whether the cover, copy, reviews, and content all align
- Whether people click, stay, and convert
That is why the old “jam every possible keyword into the listing” strategy is losing ground.
This is the same broader shift content marketers have seen from classic SEO to more GEO-style optimization: context beats crude repetition.
How Does Amazon KDP Work in the A10 Era?
If you are asking, “How does Amazon KDP work?”, the short answer is this: KDP lets indie authors publish ebooks, paperbacks, and hardcovers directly to Amazon. You upload your manuscript, cover, pricing, categories, description, and keyword metadata, and Amazon uses those inputs, along with shopper behavior, to determine where and when your book appears. Amazon also gives KDP authors access to Amazon Attribution, which helps measure the effect of off-Amazon marketing on sales and KU page reads.
Under the newer marketplace reality, your KDP book listing is not just metadata storage. It is a search asset and a conversion asset.
That means Amazon is likely evaluating two big buckets at once:
- Relevance signals
Does this book look like a strong match for the query or shopping context?
- Satisfaction signals
When readers land on the page, do they click, stay, read, and buy?
That is why listing optimization now matters so much more.
What Should You Change on Your KDP Book Listing First?
1) Rewrite your title and subtitle for humans first, search second
Your title still matters. A lot.
But the best practice now is not stuffing every variation of a keyword into the front end. It is writing a title and a subtitle that are:
- natural
- specific
- readable on mobile
- aligned with genre or promise
For nonfiction, your subtitle should clarify the outcome.
For fiction, it should clarify the genre, tropes, or hook.
Weak approach:
The Productivity Guide for Productivity, Time Management, Focus, Habits, and Success
Stronger approach:
The 20-Minute Focus Method: A Practical Time-Management System for Busy Creatives
The second version gives Amazon a clearer context and gives readers a more compelling reason to click.
Here’s a note on repetition. Do not waste valuable space repeating the same keyword in both title and subtitle. Use the subtitle to add adjacent relevance: audience, benefit, tropes, setting, or transformation.
2) Upgrade your description from a simple blurb to something that clearly matches reader expectations
Your description should help Amazon and readers answer the same question:
“Who is this book for, and what kind of reading experience will it deliver?”
That means your copy should naturally include:
- genre or category fit
- subgenre or niche
- tropes, themes, or aesthetics
- reader outcome or promise
- comparable expectations
For fiction
Use tropes, emotional payoff, tone, and setting.
Example:
A slow-burn enemies-to-lovers romance set in a small coastal town, perfect for readers who want sharp banter, family secrets, and a hard-won happily ever after.
For nonfiction
Use problem, audience, and transformation.
Example:
This step-by-step guide helps first-time indie authors publish a professional KDP book, optimize their Amazon listing, and build a marketing plan that drives consistent sales.
That kind of language is stronger because it sounds natural while still encoding clear relevance.
3) Make sure your cover and copy tell the same story
This is one of the most overlooked parts of book discoverability.
If your cover signals one kind of reading experience and your description signals another, your click-through rate and conversion rate suffer. And if those suffer, ranking usually suffers too.
A dark-academia fantasy should not look like a light contemporary romance. A tactical business book should not look vague and generic.
In other words, cover quality is not just branding. It is search performance.
4) Treat A+ Content like a conversion lever
If you publish through Amazon KDP, you may have access to A+ Content; the enhanced section of your book’s product page where you can add branded images, comparison charts, and extra copy below the main description.
For authors, A+ Content is not just decorative. In a marketplace where listing quality and engagement matter more, that makes A+ Content a real conversion tool. A+ Content is not optional anymore if you are serious about Amazon optimization.
Amazon guidance says A+ Content can lift sales, with commonly cited figures ranging from about 5.6% to 8% for basic A+, and higher for Premium A+.
For authors, A+ Content helps in three ways:
- It increases dwell time
- It gives readers more confidence before buying
- It reinforces the book’s themes, promise, and series or author brand
What to include in A+ Content for books
- a hook-driven overview
- trope or theme callouts
- review pull quotes or editorial praise
- “perfect for readers who liked…” framing
- series reading order
- images that match your cover’s genre signals
This is one of the clearest opportunities to improve conversion without changing the manuscript itself.
How Should You Use KDP Keywords Now?
It helps to move beyond single words and start thinking in reader intent. Your backend keyword fields should help Amazon understand your book’s deep niche. That means semantic phrases usually beat disconnected one-word lists.
Romance authors, for example, instead of stuffing in isolated terms like: “romance love billionaire office enemies city”, should build intent-rich phrases like:
- office romance for women
- billionaire enemies to lovers
- fast-paced contemporary romance
- grumpy sunshine workplace romance
- steamy urban love story
A practical 7-box strategy
Use your seven KDP keyword boxes like this:
- Boxes 1-2: primary topic + target audience
- Boxes 3-4: secondary themes, tropes, or outcomes
- Boxes 5-6: adjacent reader intents or comps
- Box 7: category-cementing niche phrase
Practical takeaway:
- Use spaces, not commas
- Do not repeat words already in your title
- Skip filler words
- Prioritize unique descriptors
Why Does External Traffic Matter More?
This is the biggest mindset shift for many authors. The old Amazon playbook often centered on Amazon ads alone. That can still help. But in the current environment, external traffic appears more valuable because it signals real demand coming from outside Amazon.
For authors, that means traffic from these channels can be especially useful:
- Your email list
- Promo newsletters like Freebooksy and Bargain Booksy
- TikTok, Instagram, Facebook, YouTube
- Your website or blog
- Podcast appearances
- Cross-promotions with other authors
And crucially, Amazon gives KDP authors a native way to measure it: Amazon Attribution. KDP authors can track off-Amazon campaigns and see not just sales, but also Kindle Unlimited pages read and royalty amounts earned.
Why this matters for indie authors
If you are already sending newsletter traffic to Amazon, that traffic may be doing more than generating a few immediate sales. It may also be strengthening your book’s visibility signal inside Amazon. You can source newsletter traffic from your own email newsletter, promo newsletters and author newsletter swaps. It is more important to send traffic that converts than to send a large volume that doesn’t. Amazon is looking at both the signal (traffic) and the quality (conversion rate). This is why running free promos or prices drops in promo newsletter can work so well – promo sites send a lot of external traffic to Amazon that converts at a high rate.
External traffic is important, but so too is consistent traffic. Amazon rewards a title with high-quality consistent traffic over several days and weeks. At Written Word Media, we have recently rolled out 10- and 15-day promo stacks to help authors take advantage of this element of the algorithm. These promo stacks are a simple way to drive qualified and high-converting traffic from multiple promo newsletters to your title.
What Reviews Tell Amazon Beyond Star Ratings
Amazon Reviews contribute meaningful data in the A10 world. Reviews serve two roles: First, they influence readers. Second, they likely influence Amazon’s understanding of the book. Review text contains rich contextual clues: pacing, tropes, mood, audience fit, content expectations, and reader satisfaction. A review that says: “Perfect for fans of cozy mysteries with witty heroines and small-town secrets” does more than add social proof. It reinforces how the book should be understood.
Focus on review velocity, not just volume. Yes, more reviews generally help. But fresh reviews matter too. A book with recent, specific reviews looks active. A book with old, thin reviews may feel stale to both readers and the marketplace. This is another reason ongoing promotion beats one big launch spike.
A Mini Case Study: Optimizing One Nonfiction KDP Book
Let’s say you have a nonfiction KDP book for first-time indie authors.
Original title
Self Publishing Success
Optimized title
Self-Publishing on Amazon KDP: A Beginner’s Guide to Launching and Marketing Your First Book
Why it works better:
- includes the platform context
- makes the audience clear
- promises an outcome
- sounds natural, not stuffed
Original subtitle
How to Publish, Market, and Sell Books
Optimized subtitle
Step-by-Step Help for Writing Your Listing, Choosing Keywords, and Reaching More Readers
Why it works better:
- adds concrete expectations
- introduces long-tail relevance
- improves click clarity
Backend keyword example
- amazon kdp for beginners
- self publishing first book
- how to publish an ebook on amazon
- book listing optimization
- keywords for authors
- book marketing for indie authors
- kdp launch strategy
A+ Content modules
- “Who this book is for”
- “What you will learn”
- Comparison chart with other books in the author’s catalog
- Editorial review quote
- Simple launch checklist graphic
This version is stronger because it aligns metadata, reader intent, and conversion assets.
Your A10 optimization checklist (revisit every 90 days)
Every few months, take a moment to strengthen how your book shows up and performs:
- Make sure your title, subtitle, and description clearly communicate what your book is and who it’s for
- Refresh your keywords and categories so they reflect your niche and reader intent
- Improve your listing’s conversion elements, including your cover and A+ Content
- Keep reviews coming in to show ongoing reader engagement (promos can help with this)
- Plan your next round of marketing and promotions to drive consistent, high-quality external traffic
The goal: steady visibility, strong conversion, and a clear connection between your book and the readers most likely to love it.
FAQ
What is the A10 algorithm on Amazon?
“A10” is the unofficial name many sellers and authors use to describe Amazon’s newer search and recommendation behavior, which appears more focused on relevance, semantics, and customer behavior than older ranking models. Amazon has not published a books-specific formula.
How does Amazon KDP work for discoverability?
KDP lets authors publish books to Amazon and control listing metadata like titles, descriptions, categories, and keywords. Amazon then uses those inputs plus shopper behavior and sales signals to surface books in search and recommendations. Amazon Attribution also lets KDP authors measure off-Amazon campaign impact.
What makes external traffic “high-quality” in Amazon’s eyes?
Not all clicks are created equal (if only they were—marketing would be much easier).
Amazon seems to value external traffic that:
- Comes from relevant audiences (genre-matched readers)
- Leads to strong conversion rates (click → buy or read)
- Happens with some consistency over time.
This is where many DIY efforts fall short. A burst of random traffic might look exciting, but if it doesn’t convert, it won’t help your visibility.
That’s why targeted email promotions and well-timed Promo Stacks are so effective – they’re built to deliver engaged readers who are ready to click and buy, not just browse.
Do promo sites help improve Amazon rankings?
Yes. Promo sites send qualified external traffic that converts into sales and downloads, which can strengthen your book’s visibility signals in Amazon’s algorithm.
How can authors generate consistent external traffic?
By combining multiple sources like newsletters, social media, and email promotions. Many authors use Promo Stacks to drive steady, high-converting traffic over several days instead of relying on a single spike.
Do keywords still matter on Amazon?
Yes, but not in the old keyword-stuffing way. Keywords still help indexing, but natural language, semantic relevance, and conversion signals matter more than repeating the same terms.
What is the best way to use KDP keyword boxes?
Use them for distinct, intent-rich phrases that add context you could not fit naturally into the front-end listing. Avoid repetition and keep within the byte limit.
Does A+ Content help books sell?
It can. Amazon and seller guidance consistently cite A+ Content as a conversion driver, with common lift estimates in the single digits for basic A+ and higher for premium formats.
Should authors use Facebook Ads or Amazon Ads for A10?
Both can be effective. But if you have to choose one, Facebook Ads (like Reader Reach Facebook Ads) can be especially valuable because they drive external traffic, which may give your book an added visibility boost in Amazon’s algorithm.
Final takeaway
The simplest way to think about the A10 algorithm is this: Amazon is trying to match the right book to the right reader, and it’s getting better at it. That means your job isn’t to outsmart the system with keywords. It’s to make your book easy to understand, easy to trust, and easy to choose.
When your title, cover, description, and promotions all point to the same clear reader promise, and when real readers are clicking, buying, and engaging, those signals start to compound. And that’s where momentum builds. Because in the end, the authors who see the most success aren’t the ones chasing the algorithm. They’re the ones creating a strong, consistent connection between their book and the readers who are already looking for it.