Boot strapping is definitely my preferred route for many reasons including what you mentioned. I'm interested in learning more about how to use an existing user

Boot strapping is definitely my preferred route for many reasons including what you mentioned. I'm interested in learning more about how to use an existing userbase to create more products, pricing, and product / market fit. I'm almost done reading Monetizing Innovation and can't wait to try some of the things I've learned in the book. What else do you recommend reading?