I feel like trying to better humanity, even if I fail, is a better use of my time than simply saying nothing can be better and giving up. At least by failing well, at worst, the next delusional person can carry the work forward learning from my mistakes.
It is going to be a slog, likely over multiple generations, but one worth the climb.
If you have the capacity to do that, I.E. a multimillionaire, then sure.
Capitalism is just a bootloader to get us there.
Humans once built things to benefit society over multiple lifespans.
That is not the things that can be unlimited. There will always be better food, bigger houses, better medicine etc.
In the eyes of the bottom 30 (or maybe even 60) percent of humans on the planet Earth average American already has the access to unlimited food, shelter, medicine, and knowledge. But good luck to convince Americans that they have those access.