[rg111]

Having a good circle of friends or being part of a serious book club. You form personal connections with people of similar taste. You get goos recommendations from such people.

There are books mentioned inside books and movies that you like. Try those.

Search for a book in particular topic, append reddit. Go to reddit thread, and try books that appear in many comments are the most upvoted.

Search "books" on HN. You will get ~10 years worth of reading in about ~30 mins browsing.

You must have people that you look up to- professionally, among relatives, etc. There must be some people that are bookish? Take recommendations from them.

You must have a niche area of interest? Follow forums/groups of that group. What books come up more often? Read those.

There are a lot of such advice that I can continue with. Probably a whole blog post. But, that's for another time.

All advices above are practised by me. None are theoretical.