The game has potential, but it suffers from feature creep. There are so many things to do, yet they are not well implemented.
Here's what you should do:
Lock every feature besides the Brothel and the Girl Market. Focus on improving the building system, currently if you choose to not repair a room but there's another one on top, that room becames unusable. Maybe remove it and add something else as a money sink, like salary to the girls based on the room they're working.
Upgrade rooms should increase the amount of girls you can have at that room like from glory hole it goes to double glory hole etc, which would increase the income. Just increasing income is not optimal.
After the core mechanics of running the brothel are done and fleshed out then you start working on those other things. I'd love if the game would be kinda like the Theme Hotel game but a brothel.