Make sure you have max plunder! You get max plunder by hiring tutors at certain prices. Use either of these formulas (depending on whether your combined stats is in the thousands or millions) to calculate how much you should have invested in tutors:How can i increase money won eveytime i do a action in party, i win at least 7.54 million. I want to increase it.
1kcs × 15M or 1mcs × 15B
The only other way then is to add new dormmates or upgrade pre-existing ones
edit: o i got nerfed by day while trying to remember the max plunder formula rip