It's going to be labor-intensive and time-consuming, but you need to take all the books down and put them on the floor. Take them down and spread them in one area. Physically pick each book up, one by one. If the book inspires you, keep it. If not, it goes out. That's the standard by which you decide.
Marie KondoRelated topics
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The return from your work must be the satisfaction which that work brings you and the worlds need of that work. With this, life is heaven, or as near heaven as you can get. Without this with work which you despise, which bores you, and which the world does not need this life is hell.
W. E. B. Du Bois