Finding Affiliates for Digital Books

I made this e-book https://nofapguru.gumroad.com/l/wta-how-to-heal-book/15?_ga=2.269214264.81698734.1627150798-2129184778.1604595535

made some sales, but would like to grow it a bit further with the affiliates.

Where are some good places to find affiliates for digital books?

Thank you for answering ;)