Source: Self-Publishing Advice
If you find yourself struggling with your Amazon ranking, then the keywords you’re using or not using in your book’s title, subtitle, and description could be the problem. Keywords are one of the more important aspects when listing your book on any vendor’s website.
From the original article:
“Amazon Kindle SEO is the process of using keywords to have your book rank higher in Amazon search results than other books. If you’ve put blood, sweat and tears into writing a book, you want readers to find and buy it!”
The article includes a seven-step process to help you determine if your keyword strategy is working or if you need to overhaul it for your book.