Stop rereading them and read something else in another genre! There are a lot of positive things that can come from fantasy/fiction, not least strengthening your imagination and gaining empathy by relating to characters in unusual and difficult circumstances. But if you’ve read these books that many times you probably aren’t stimulating your brain in those ways bc you know the stories too well.

Basically to get the all benefits from reading fiction that do factually exist… you have to read new/different things, not just the same things over and over again