One of the best ways to promote your book is to attach your book to a bestselling book title similar to yours. Here, for example, is a great graphic that you could copy to promote your book.
Create a graphic like this: If you liked this (the bestselling book), try this (your book title). Add the book cover graphics to create drama and interest.
Then share the graphic via your social networks as well as on your own website and your Amazon page. Ask your friends to share the graphic as well wherever they can.