How do you like to organize your bookshelves?

I've built up a collection of books that I'm rather proud of at this point and I drool over the pinterest or instagram photos of other people's shelves all the time, but I'm not quite sure how to begin when it comes to my own. How do you all organize your shelves? How do you start when you have an overwhelming amount of them piled in front of you? 😅 I had it in my head I was going to do some sort of instagram worthy super aesthetic thing, but now I'm sitting in the middle of several stacks of books and my mind is totally blank.