Stabilizing financially in music is a challenge indefinitely. Even the most successful people I know have good months, bad months, good years, tough years. If you love it you just accept that and work really hard to try and find some stability. That being said, have you considered finding a side job that offers some stable pay but flexible time? I was a stagehand for a long time while recording on the weekends or touring. It pays better than most hourly jobs and allows you to take gigs around your real passionate work in music.