Social media (goodreads/tiktok/reddit)? Colleagues? Friends? Browsing the library/bookstore? Asking for recommendations from staff at libraries/bookstores?
BONUS: if you can remember, how did you find books you really enjoyed?
I realized a lot of my favorite book recs came from reddit. I was a subscriber of r/books and picked up some really good books there. Piranesi by Susanna Clarke is an example.
Mostly my kids, although one of them is super into furry fan-fic and keeps sending me ridiculous things to read so I don’t listen to him anymore. But the other three all tend to send good series to read, and we often will read them together and discuss the books in the family Discord server.