My collection of books is much smaller then yours, and has a pretty simple system, because I like to know where each book is without making a complex system.
First I organize them by type, like if it's a craft book, or fiction, or manga. And then the title of the book. I don't care about organizing by author because the books by the same author is most likely a series so I put them together.
For a bigger collection I would organize them like the library. Non-fiction and fiction, genre, author, and title.