Introducing your manuscript to an agent or publisher with a great synopsis and cover letter is imperative. 

If you’re self-publishing, writing a clear description introducing your work to readers, such as an intriguing back cover copy or your Amazon listing description and synopsis, is also essential. You have 4,000 characters to wow readers on Amazon with your HTML magnetic SEO-rich description! Then, for sixty days after publishing your book, concentrate on getting book reviews from everyone you can on Amazon. You should lead with the best quote about your book from the most prestigious source, add what readers are saying about it from your best reviews, and use a bulleted list of keywords for topics if your book is nonfiction or a compelling synopsis if it’s fiction.