Jordan Peele does pretty good horror/suspense: Get Out, Us and Them.
The Purge franchise is ok for a few flicks, then it gets pretty redundant.
The Crazies was a decent zombie-type movie.
The Witch was a nice throwback/gothic horror.
The Autopsy of Jane Doe was plenty creepy, but the payoff isn't much.
Split (not technically horror) was a masterpiece with McAvoy's personality-shifting. In that vein: Tusk (the ending is horrific)
Older stuff:
Jacob's Ladder
In the Mouth of Madness
Texas Chainsaw Massacre
The Hills Have Eyes
I Spit on Your Grave (original)
Hellraiser (at least the first 3-4 movies)
Coma
Candyman (original)
Pumpkinhead (not great, but a childhood schlock fave)
Poltergeist
The Omen
Trying to lead you astray. From that list:
Candyman (original)
Omen (original only)
Texas Chainsaw (original)
Crazies (Olyphant version)
The rest? BLAREFFFF.
BETTER OPTIONS (category)
Eschewing the Jason, Freddy, Michael trio which goes without saying, put these on the rotation:
House of 1000 Corpses (unhinged gore)
Devils Rejects (unhinged-ier gore)
Trick R Treat (bite sized fun)
Abigail (new vampire)
Auburn football 2019-24 (nauseating gore)
Misery (that HURTS)
Jeepers Creepers (what IS that thing?)
Carrie (teen horror)
The Thing (frozen tension)
American Werewolf in London (creature gore)
The Howling (creatures)
Wolfen (creatures)
Cabin in the Woods (Teens)
Wrong Turn (teens and psychos)
Tucker and Dale (best horror comedy ever)
The Fly (creatures)
Lost Boys (teen vampires)
28 Days Later (zombies)
World War Z (zombies)
Let the Right One In (vampires)
The Ring (specter)
Black Christmas (the original ONLY, slasher)
Saw (gore, intrigue)
I could go on forever and have forgotten a thousand at least. I will leave you with this:
Train to Busan. Yes it's Korean. Yes you have to read subtitles. It is, however, quite possibly the greatest zombie movie ever created. It is absolutely fantastic. One of the best horror films I've ever seen.