-Change the Medusa Potion to Zynga's drawing. Your's looks like paper, and looks fake.
-Split The Servers
-Make new levels
-Make new jobs
-Make new HOUSES
-Make and release furniture! (Old or New)
-Take out expired themes
-Balance out the prices better
-Be able to trade/sell houses!!
-Put a V.I.P membership available!!
This is a lot of stuff, but I bet with every one of these items done, you will be banking more money than you know what to do with!!