I think a big misconception on your own part is that Communism would put a ceiling on people. It would, perhaps, in the sense that it wouldn’t let people lord over others, but it would absolutely not prevent people from working to improve their own material conditions. In fact, that’s one of the base assumptions made by Marx when proposing a Communist system!
The goal is a Stateless, Classless, Moneyless society, where you can get what you need from what you can give. It isn’t a society where everyone lives in a 700 Sq ft 2 bedroom apartment made of concrete, it’s a complex system meant to be built up towards, that would allow people to work on whatever they want and get whatever they want by working for it, as long as what they want isn’t a business to lord over people.