Sometimes I use Reddit to search up nonfiction book recommendations on r/books with searx.be (it automatically fetches you results on the old reddit website) because to be honest, it’s pretty much one of the few places where I can find nonfiction recommendation for niche topics or just nonfiction readers in general (that isn’t just about self-help books). Not only that, the users generally give a synopsis so it’s easier to find what book you’d be interested in. But since Reddit made porn less accessible, my reddit usage dropped significantly.