There is magic in the spoken word. Because our voice is unique it holds an energy, a vibration, and the listener can sense that. Think about the term being on the same wavelength. Through the vibration, the story the author is telling becomes very lively and creates a deep emotional connection with the listener.
This is where things can get exciting with your book as a podcast as opposed to (or in addition to) an audiobook.
There are so many podcasts to be a guest on! How do you choose which ones are a good fit? Introducing Listen Notes. https://youtu.be/DFHEJDMktUk
If you have a podcast, you have some, well, power, authority, credibility. Just like if you have a book, you instantly have some leverage...