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.
For enjoyment, I’ll get recommendations from my hairstylist, believe it or not! Or I let Goodreads think for me sometimes. Other times, for work, it just depends on where my academic research leads - in the former case, kind of hit or miss, but of course for my job, whatever I end up reading is obviously going to be in my wheelhouse/relevant to my interests, anyway, so those are rarely intolerable!
Searching around book stores (e.g. National Book Store, Booksale, Fully Booked, and other physical book outlets), Goodreads (including lists, and even checking reviews by S. Craig Zahler and Cardinal West), YouTube channels like Cardinal West, Jesse the Reader, etc., TV Tropes, and the occasional Reddit post and Telegram chat. I once even searched around my school's library.