Standalone book would be Ender's Game, but if I could pick a whole series I'd say the "Sword of Truth" books by Terry Goodkind. Been reading them and enjoying quite a lot. Would recommend!

Thanks! Been trying to find more material to read outside of fnaf books, so this is a big help! A personal favorite of mine, if you also want a suggestion (that isn't fnaf lol), is Sirens by Braden Cawthon.