Publish the first book free on kdp.amazon.com and price it as low as possible ($0.99)

Run a 5 day free promo where you will giveaway your book for 5 days.

In the first page of your book, tell them about a free gift (that will be your book)

On the first page it would look something like this:

Free Gift for my readers

Download my unreleased book

“3 action steps to making $100 per day online”

The other option you can do is get them to visit your blog posts