[dorchadas]

I'm not OP, but I just follow my interests. Thankfully, at least with non-fiction, they're fairly broad, so I've read academic textbooks on religion, textbooks on programming, general science books on physics (to complement my textbook knowledge) as well as anthropology, sociology and more. Just find a topic you're interested in, go to Goodreads (I like it a lot more than Amazon for searching books), and see what you can find. Or Google it, and see what trusted people in fields like/recommend. Or even people with interests that align with yours.

As for fiction, I like mostly fantasy, so will browse the shelves and look at hyped books on /r/fantasy, as well as other, lesser-known ones that sound/look interesting (I'm a proponent of looking at covers and titles to see if it seems interesting to look into deeper). I also used to follow some reviewers. For more "literary" fiction, I look mostly at what mainstream reviewers say. I found All the Light we Cannot See that way, and loved it (except for one scene I felt was just completely unnecessary to the novel). Then, perhaps, look for major authors. Umberto Eco is one that comes to mind that I'm fixing to start.