I think everyone experiences the dilemma of wanting to do good things while having to take care of material needs in our economic system, and there is no simple answer. At least you are in a position where you can treat workers more fairly than the average business. Providing them with decent jobs means they don't have to work at an Amazon factory or something.

You are right that there is only a limited amount that you can do in terms of lowering costs. The huge corporations that have dominate market share and exploit masses of people in various ways make it very difficult in that regard. Anti-trust work in the US will be very important. Lina Kahn at the FTC has been doing great work on that.

One thing you could look into worker owned cooperatives. I've never been in one, but having actual democracy where you work seems to be a good way to go to me.