Backstory: I recently purchased David Goggin's audio book, Can't Hurt Me. I can't stop listening to it, I've almost powered through the 13+ hour audio book in a few days. I'm hooked but once I'm done, what's next?
The Idea: A website that suggest similar inspirational figures based on ones that you like.
Deep Dive: You could build a platform to crowdsource this information, you would allow users to upload motivational/inspirational figures and pair them with others that they feel are similar. You would have to build in a report system that would flag pairings as incorrect and you would manually review and override any errors.
For each person that is uploaded to the site, you could crawl amazon and the web to find their books and online resources to link on your site.
Validation: I'm almost done with this book, any recommendations for what's next?
Monetization: You could offer affiliate/referral links for books and other resources you offer on the site.