"DYNAMICS" "dynamics"
Don't play every song and every part of every song at the same volume.
And teach your bandmates the same thing. Practice controlling your volume and the
band's volume.
Like have an orchestra conductor leading the group.
If you have a lead singer, maybe he/she can do it. It has to be someone who is aware of what's happening with the whole band. Or have a signal system worked out among the members. We had a guitar player who was good at that. He used to tilt his guitar up a bit for louder and down a bit for lower.
For example, play a bit softer when a lead is being played or when the vocals need to stand out. Learn to emphasize bits and pieces of a tune using individual and band dynamics.
The drummer can be the driving force for dynamics. Pounding on the drums all night, oblivious to the needs of the song, the band and the venue get old real quick. I've heard too many gigs where overbearing drums ruins the entire show. I recently heard a band where the drummer had his drums wired with small individual mikes and attached to a small mixer on a stand that he monitored. The drum mixer ran one cable to the P.A. He played at a medium low volume and let the sound guy put the drums in to the overall mix at the right level, just like the vocals. Best setup I've heard.