I think it’s fair to say that I got lucky - you’re not wrong, they needed someone and I happened to have a very specific experience that matched with their need.
I met the team, I knew they liked me, and I really liked them. I also knew it was likely they couldn’t afford the comp I was getting at $lastjob.
My plan going in was to use that (scary to them, but very real) number to negotiate a four day work week at a full time salary. It worked out.