No, I wouldn't stop writing. First, a million dollars isn't what it used to be. I suspect over the next 50 years (and I do plan to be around), I'd run through that money if I weren't careful. Second, I've always written, from the time I could hold a pencil in my tiny hands. It's my therapy, my expression and part of who I am.
I'd probably invest some of the money and create my own publishing house/production company for BIPOC and neurodiverse authors and screenwriters so that our stories can be told. Oh, and I buy a better car, nothing fancy, but my old one is getting a little long in the tooth. :)