You can gain Cash in several ways:

• Passively through your Office in your Home (once it's renovated)
• As rewards through Collabs throughout the City
• Through Side Hustles (collecting cash at different locations with your Roomies)
• By buying Cash Tokens at the Store!

Be careful! Having too much Cash overcap leaves them vulnerable to be stolen from you if you don't have Security activated and another player causes Drama with you!