Board Thread:Casual Discussion/@comment-45026382-20200210135412/@comment-26143371-20200210222951

If you haven't already, buy all the land that is available for Cash, get all the Aspirational Buildings and complete Road to Riches.

Apart from that you can always convert money to donuts by repeatedly buying and selling expensive stuff (often referred to as Kwik-E-Mart Farming or KEM Farming. You buy stuff with money, which gives you XP, which gives you additional levelups which gives you more donuts. The usual items for this are the Kwik-E-Marts, Bloodmobiles and Rat Trap Delivery Trucks.

Ideally you should have the XP Collider active while doing so, it will increase the conversion rate by a factor of five at a constant cost.