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.
Many times I aimlessly wrong around the bookstore down the road from my house (I live on the shore) and I pick something there. Most recently picked up Killers Of The Flower Moon, which has been an incredibly interesting read.