I have to recommend 2014’s “As Above, So Below”. A bit like the Descent, but in the catacombs and a lot more surreal. It was an absolutely horrifying concept and it delivered very well.
Midsommar and the Witch weren’t scary IMO. They were twisted and weird, but lacked majorly in the fright department.
OTHER:
The Autopsy of Jane Doe (2016).
I thoroughly enjoyed it. Great directing, great supporting cast.
Of course, I don't like most kinds of horror. (Get Out was good.)
Went with the witch and hereditary. But the wailing is a definite worthy 3rd.
Honestly a lot of great horror this decade in my mind.