I loved Hereditary, it is probably my favorite 2018 film. When I researched online about the film, I discovered that Ari Aster was deeply influenced by classic and brilliant horror movies such as Carrie (1977), Rosemary's Baby (1968) and Don't Look Now (1973).
Ari Aster considers himself a horror fan and he has been loving horror films since he was about 11 years old. However, he has an unique taste in films in general, so here you can find films that he has recommended and considers them his favourite picks.
Some of them are mentioned in his personal Twitter account: @AriAster
If you know more, please, let me know.