If your Amazon strategy still looks like it did a year or two ago, it may be time for an update.
Amazon’s A10 algorithm appears to reward a different mix of signals than the older A9-style playbook. Instead of relying so heavily on keyword stuffing and Amazon ads alone, the marketplace now seems better at interpreting context, buyer intent, listing quality, and off-Amazon demand. Amazon has not published a formal “A10 for books” rulebook, so what authors know comes from observed marketplace behavior, Amazon product-search research, and platform tools and guidance.
For indie authors, that means this shift is not really about “more keywords.” It is about building a more complete, more convincing, more discoverable book listing.
If you only do five things, do these:
The big idea: Amazon is getting better at matching books to reader intent, not just matching books to exact keywords.
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:
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.
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:
Does this book look like a strong match for the query or shopping context?
When readers land on the page, do they click, stay, read, and buy?
That is why listing optimization now matters so much more.
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:
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 “blurb” to “intent match”
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:
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:
What to include in A+ Content for books
This is one of the clearest opportunities to improve conversion without changing the manuscript itself.
Stop thinking in single words. 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:
A practical 7-box strategy
Use your seven KDP keyword boxes like this:
Watch the byte limit
Amazon sellers widely reference a 249-byte limit for backend search terms in major Western marketplaces, and going over it can prevent indexing.
Practical takeaway:
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:
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.
That is one reason consistent promotional support matters so much.
Reviews do two jobs:
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.
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:
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:
Backend keyword example
A+ Content modules
This version is stronger because it aligns metadata, reader intent, and conversion assets.
Every 90 days, review:
Do not treat your metadata like a one-time setup task. Treat it like an evolving sales asset.
“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.
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.
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.
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.
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.
Yes, but they should not rely on them alone. A healthier strategy combines Amazon ads with qualified external traffic from newsletters, social, partnerships, and content marketing.
The smartest way to optimize for the A10 algorithm is to stop asking, “How many keywords can I fit in?” and start asking:
“Does my listing clearly communicate what this book is, who it is for, and why the right reader should buy it now?”
That is the shift.
And for indie authors, it is actually good news.
Because the authors who win next are not necessarily the ones who can game the system best. They are the ones who can create the clearest, strongest match between book, reader, and buying intent.