Level 20 to 29 in 20 minutes

Got the time quest and thought it was a great game, but the next day I didn't have any dice and could barely play for 9 minutes. I waited two days and logged back in, and they're giving out tons of energy. I think I also got the comeback rewards after the event ended. I usually play Monopoly to build a bunch of buildings all at once after getting the welcome bonus, and it feels faster than playing daily. Anyway, it warned me that leaving coins would lead to raids, so after finishing all the buildings, I logged out with about 10 minutes to spare. What should I do to kill time?