My first suggestion was going to be Stephen King’s IT, because it’s very interesting with A LOT of detail that both the original and remake didn’t have in. So learning more the origins of derry was very cool and creepy. But I would say if you want something more psychological and also give a creep factor (not as much IT did) that puts you in the mind of the character that the person’s insanity is slowly fading away is Pet Semetary