Your book listing on Amazon.com, the biggest bookseller in the world, is critical. So long as you follow the rules you can make it as robust as you want. Although you can no longer add pictures to your description you can add special formatting using html to make your description stand out.
In your description consider adding:
An actual one or two paragraph description of the book and characters.
Table of contents for a non-fiction book.
Testimonials or reviews that won’t show up on Amazon.com.
Links to your social media sites.
This space on your Amazon.com description is like gold. Use it wisely!