I can see a lot of opportunities, but I would not be in a position where I can leave my permanent employment yet (living wage needs) but I know I could perform my job just as well.
How did you make the crossover?
I'm in the middle of making this transition right now. Juggling full time employment and a booming side project is exhausting.
You can also contract (staff aug) to help make ends meet before your consulting takes off.
So, first get your financial house in order, then moonlight a bit to see if you like the OSS project or technical stack, then pull the ripcord.
Source: built a startup after quitting full time contracting; also taught certification courses while building the startup to extend runway.