Amazon KDP Marketing — How to Promote Your Self-Published Books
Writing the book is just the beginning. Marketing determines whether your book sells 10 copies or 10,000 copies. Here is how to promote your KDP books and build an author business.
Most self-published books sell fewer than 100 copies. The difference between a book that sells and one that doesn't is rarely the quality of writing — it's the marketing. Amazon's algorithm promotes books that sell quickly after launch. A well-executed launch can put your book on page 1 of Amazon search results, where it continues selling for years with minimal ongoing effort.
Amazon Ads for Books
Amazon Advertising for books is the most direct way to drive sales. Three ad types: Sponsored Products — your book appears in search results when shoppers search for related keywords. Start with automatic targeting to discover converting keywords, then move winners to manual targeting. Sponsored Brands — banner ads featuring your book and brand. Product Display Ads — show your ad on competing book pages and related product pages. Budget: start with $5-10/day per campaign. Target keywords related to your book's topic and category. Target competing books by ASIN (Product Display Ads). A good ACOS (advertising cost of sale) for books: 20-30% for low-priced books ($2.99-4.99), 30-50% for higher-priced books ($9.99+). The goal is not profit from ads but ranking — higher rankings lead to organic sales that eventually sustain the book.
Book Launch Strategy
The first 30 days determine your book's long-term trajectory. Pre-launch (4-6 weeks before publication): build an email list by offering a free chapter or companion guide. Send advance review copies (ARCs) to 50-100 reviewers using services like BookSirens, NetGalley, or your email list. Amazon requires reviews to start ranking — aim for 15-20 reviews on launch day. Launch day: set your book to 70% royalty at $2.99 (the sweet spot for KU enrollment). Run Amazon Ads from day one. Enroll in KDP Select (90-day exclusivity) to reach Kindle Unlimited subscribers — KU page reads can account for 30-60% of total income. Promote your book to your email list and social media followers. A strong first week signals Amazon's algorithm that your book is popular, boosting its ranking in search results and recommendations.
Getting Reviews
Reviews are the #1 factor in Amazon book purchasing decisions. Books with 50+ reviews convert significantly better than those with fewer. Strategies: Amazon Vine — Amazon's official review program. You provide free copies to trusted reviewers (cost: $200 per ASIN for enrollment). BookSirens / NetGalley — ARC distribution services that connect your book with readers who review. Email your list — ask readers who enjoyed your book to leave a review. Back matter — include a call to action at the end of your book: "If you enjoyed this book, please leave a review on Amazon." Never pay for reviews or exchange reviews in groups — Amazon will ban your account. Focus on delivering a great reading experience, and organic reviews will follow.
Building an Author Platform
Successful KDP authors don't just sell books — they build an audience. Start an email newsletter for readers interested in your topic. Publish consistently to build a catalog — authors with 5+ books earn significantly more than those with one, because each book promotes the others via "Customers also bought" recommendations and series links. Consider offering the first book in a series free or at $0.99 to attract readers and upsell them to higher-priced sequels. Repurpose your book content into blog posts, YouTube videos, and social media content — each piece of content drives new readers to your book. The most profitable KDP authors treat their book as the entry point to a larger ecosystem: books → email list → courses → coaching.