You can search for Associations that work within your topic of the book, you can get booked on podcasts, or even get booked for a TEDx talk.

The best way to get booked is:
1) what is your message to the world
2) who needs to hear this
3) where do they hang out

Answer these questions and you are on the path to getting booked. I wrote an entire guide on how to get booked to speak. Bit.ly/GetBookedToSpeak