I upgraded all of one building type to max, put them in storage, then moved onto another building. I also worked on what ever was in the task book just to get rid of that task. It took a while, but I got there eventually. It's probably not the best or fastest way..
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https://forums.ea.com/en/the-simpsons-tapped-out/discussion/81718/sh-tables#latest
I know, but I don't like the look of most of them. I have a few out now, but not many.
Upgrade the Buildings
Get all upgraded characters for the Coffee Shop and LA Body Works. Everything springs from those 2 places.
Set little goals instead of the big picture and just chip away. Focus on the highest paying buildings too.