Below is a terrific summary of practical things you can do to make your book more visible on Amazon.

It comes from the enewsletter of Smith Publicity, Inc.
Kudos to Book Publicist Jennifer Tucker who put together the list.

1. Author Central
Think of Author Central as your “main hub” in the wide world that is Amazon. Beyond creating an author page, which will educate customers about you and your book and display essential information about your biography, blog posts, etc., you can also use Kindle Direct Publishing (KDP) to set up your book for the Kindle if you own electronic rights. Also through Author Central, you can track book sales numbers across the U.S. for the past four weeks to identify sales trends, utilize the CreateSpace platform to publish your next book, and explore Kindle Direct Publishing Select, which will allow you to earn higher royalties.
   
2. Amazon Forums
Amazon offers a variety of discussion forums for authors, which can help you to network with other authors and expose your book to a new audience interested in your genre. You can also learn just by reading other posters’ questions, advice, answers, tips and tools. Feel free to reach out to other authors (who are often avid readers themselves) to ask for feedback on your book, to position yourself as an expert in your field, and to just have fun!
   
3. Amazon Keyword Tags
By using the tagging feature, you can make your book more searchable almost immediately, if done correctly. Check out tags on other books (especially top selling titles!) in your book’s genre and make your own tags accordingly. The more keywords you have tagged, the better readers will be able to find your book within a slew of other books. Fun tip — think like a reader: what keywords would you use to search your book? Also, changing tags each week or every few weeks gets your book in front of new audiences.
   
4. Amazon’s Listmania!
Listmania! is another tool that authors can utilize to reach potential book buyers. Listmania positions your book among other books in your genre by adding your book to book lists, but word to the wise: for best results, make sure to be very selective and true to your book’s genre when choosing your lists.
   
5. Amazon’s “Search Inside the Book”
Just as book excerpts    draw readers in, Amazon’s “Search Inside the Book” feature allows readers to flip through some of your book, with the goal of making them want to read more. This feature also works to prevent negative comments because by previewing the book, the reader has a better understanding of your book’s content. Be sure to have your personal Amazon page set up before you move forward with this tool, as it can take time to be approved by Amazon.
   
6. Amazon Marketplace
Amazon Marketplace serves as a third-party online storefront where you can sell your book alongside the array of other Amazon goods. While it’s a great tool and can offer you more freedom as an author (you can choose to give autographed copies of the book, for instance), authors must be willing to carry a book inventory and must have this inventory already on hand to be set up in the Marketplace. It also requires plenty of time and patience for authors to manage their own online book sales, though many authors enjoy the control that they have over the price of their book and fulfillment of book orders.
   
7. Amazon “So you’d like to…” Guide
With the Amazon “So you’d like to…” guide, you can actually build a guide around your book topic, genre, or specialty, which will position you as the expert of your book or field. This free tool allows you to think outside the box when it comes to book promotion and gives you the option to include your book with other Amazon products, essentially creating a “bundle” of items relating to the “So you’d like to…” Guide topic. Authors can choose to write content about the subject and, within the content, mention that the book is for sale on Amazon.