[revorad]

This is the perfect kind of product, which can benefit from a meme app like threewords.me or thathigh.com. Make an app through which people can share some quotes (funny, inspirational, etc) which has a viral loop built-in. Get some buzz going and instead of showing someone else's ads, sell your own product.

You need to jazz up your homepage a bit more. Show an example book. This should be on your homepage, not hidden behind 5 clicks - https://www.thewisdomofothers.com/book-examples#/page/1.

Mine twitter for quotes and have a live feed running on your homepage.

This is a user generated content product. You need to leverage that. Make all content free and public and just sell the hardcover book.

Your pricing looks way too complicated. I'd say, have one single price so that it's an easy impulse purchase.