My last band got so sick of being ripped off by promoters, playing in between completely different genre acts, we took the plunge and became our own promoters. Hire a function room in a place with a music license, ideally with its own bar, and pay a trusted mate to staff the door. With a couple of other acts on the same page, this can be a money spinner, especially if you add merch. It doesn’t work if any of the acts treat it like a free rehearsal and don’t promote it properly, though.