add a space system to the game. you are already a billionaire and as a real billionaire you need to create a space company. start your company with buildings for training astronauts in the office. after that, build a rocket factory (in a warehouse), and then launch a rocket at the cosmodrome. New product: space food
That totally sounds like an idea for a dlc after full release. 
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Yeah, I hope they’ll add DLS about space