Hi,
Practice and play better. Pay your dues. Join a better band. Play better gigs.
When I was playing high school dances in the mid-70s I would average $35 a gig for a 3 hour dance. When I started playing bars in college in the late 70s the average was $50-$75 (mostly five 45 minutes sets with 15 minute breaks, 8:45pm-1:45pm). The average bar gig stayed $50-$75 for decades while I worked 4 to 6 nights a week.
The last few years I've been playing in better bands at better gigs, a lot fewer bar gigs and more showcases, amusement parks, casinos, private parties, corporate events, etc, and averaging $175-$600 a gig. Our most strenuous gig is four 45 minute sets with half hour breaks, 8:30pm to 1:00am. Our NYE gig at Disney was 5 half hour sets with half hour breaks, 8:00pm-1:00am. Most of our events and private parties are only 2 or 3 sets.
This is our monthly gig at The Ranch, the "most strenuous" one. They even feed us! We get fed on most of our gigs.
I still take a sub gig now and then in local bars. This Friday I'm working with a classic rock band at a sports bar in town. I'll make $100.
Some markets are better than others. It can be tough away from the big cities.
I also had an occasional big band jazz gig for a while in the late 70s. The band had about 16 pieces in it and we all played for the fun of it. We'd make $10 a night but we didn't care. We would read out of fake books all night and had a blast.
The good gigs and good bands are out there. Keep plugging away and you'll get there.
Thank you for your indulgence,
BassCliff