I'm not too familiar with the shudder catalog tbh. Tubi has a decent collection of mainstream but slightly older stuff but where they're awesome is cheap (mostly bad) horror if you enjoy that sort of thing. I'll just put random stuff in the search like "shark" and they'll have a few dozen oddball shark horror movies.

I searched for Thanksgiving the other day out of curiosity and found gems like The Last Thanksgiving (Meet the Brimstons. They're a normal American family with one exception: Every November, they hunt down anybody who doesn't celebrate Thanksgiving.), Derelicts (Thanksgiving day for a dysfunctional upper class family takes a terrifying turn when their suburban home is invaded by a gang of sadistic drifters.), and Thankskilling (A murderous turkey hunts down five college kids on their Thanksiging break. Can the survivors break the curse and defeat the possessed bird?)