How do you - or, how did you - leverage your hobbies into careers?

Hey there! I'm an office monkey doing IT stuff. I've mercenary'd my way across multiple teams for the last decade (level 1 support to basically DevOps for payment systems) with no formal training or certification at a fairly large company. It's nice that my bosses all seem to appreciate that I'm flexible, but my work kinda swells and relaxes every couple months, and sometimes it feels unstable since I've never actually put any of this knowledge into an accepted certification. I look into certifications but nothing jumps out; recently I gave AWS a shot in a self-guided course and realized I was pretty bored by it. Something that popped into my mind as I noticed that I don't really have a "portfolio" is that I have tons of car work, audio editing, off-the-cuff writing about games, etc things that have to do with my hobbies in gaming, cars, music, shitposting on the internet, etc that I'm happy to make without feeling pressured. I feel like if someone asked me to pick up something like this for pay and give me a deadline - a program to edit, a car to work on, an image or audio to manipulate, something analyzing a piece of art - I'd happily do it without even thinking about it, and they're the kinds of things I could do for hours losing track of time.

Being a breadwinner right now with a kid I don't have the risk factor to jump careers right now, but if I lost my job I feel like I'd want to give some different industry a shot. Problem is I just don't get how people... weasel into these things? Is that how this happens? Or do they just eat a ton of time/money making these laterals? Where do they get the experience, where do people find the connections? I'm curious - has anyone ever turned a hobby into a career? Did it work out?