It depends how far you are in the game. You could consider buying a few more houses to boost income:
https://forums.ea.com/en/the-simpsons-tapped-out/discussion/101056/house-prices#latest
Have all Springfield Heights main buildings in your town for the hidden bonus, increase your multiplier, buy all 5 beach hideaways and upgrade them....
https://forums.ea.com/en/the-simpsons-tapped-out/discussion/90074/tips-for-new-players/p1
https://forums.ea.com/en/the-simpsons-tapped-out/discussion/81718/sh-tables/p1