I was supplementing my income with copywriting for a long time (which then became my main source of income last year, because I don't do online teaching!). Then I got extremely lucky with some crypto investments, so much so that I can now play with pretend money on the internet full time.kind of OT, but (without triangulating yourself) what did you move into after 10 years of EFL, if you don't mind me asking?
I loved teaching, and there are some things I miss about it (to the point that I told my old boss I'd be willing to cover here and there), but the total lack of prospects for advancement got to me eventually. That and the fact that the industry is toxic in many ways. Seeing non-native friends with C2 English and degrees in education getting passed over for jobs in favour of backpackers with the right passport time and time again...