If I really had a million subscribers? I'd probably go hide my head under my pillow and stop writing. Some of the stuff I write is too personal to want it in a million people's inboxes. I don't want to be a household name.
Maybe, what I'd do instead is to quit with the autobiographical stories and just post my fiction and art. Serialize one of my books under a paid subscription and then quit my job to write stories full time. I might also start a community for autistics, though whether that would be focused on writing, some other mission, or just a place to get to know each other and get support, I don't know.