It is possible to earn more money, even at your level.

You can make money passively byinvesting in parlours or your booble server. Both methods demand the participation of your girls (parlour -> hoes, booble -> actresses). So it is a good idea to recruit better girls and keep them happy (gifts) and in shape (gym, SPA). Additionally you should upgrade your infrastructure (Boobleserver class and live cabines, guards and interior things for parlours).

Active methods of earning money are cockfighting (you can get 10% of the cash amount of your opponent for a win) and raiding (combination with raiding league would be a good idea). Furthermore you could send your girls to the street, but this can be risky because the normal girls are unprotected and can be stolen.

Just my two cents regarding your problem/question. Searching in the forum (and server1 forum) can offer your deeper insight ;-)