Here's my story. I'm deaf in my right ear and about 10% down in the left. I can't hear in a crowd unless the hot spot monitors are deafening loud and aimed directly at my left side about ear level.
The solution for me was Shure in-ear monitors. Little 8-channel wireless systems that everyone in the band now has. $ 3,000.00 plus dollars spent largely to help me out. The result is no extraneous noise. I control my own volume and I can hear the entire front end mix. A bonus is tighter harmonies with the entire band and we are all aware of our own front end volumes and we are not trying to compete with each other. We are singing with each other.
The down side. The little ear phones from Shure are absurdly costly and easily tangled. They cost a 9 volt battery every four hours and they don't work in every venue. Like low roofed opensided gazebos or civic preformance semi trailer stages made entirely of old Buicks.
But on a big stage or in a small pub they are for me, underline for me, just the trick.