Is the idea of a 'limitless America' still realistic in today's economy?

I've always been drawn to the concept of America as a place of endless opportunity, the 'land of the free' with unlimited potential for anyone willing to work for it. However, lately, reading about wage stagnation, massive infrastructure deficits, and increasing wealth gaps makes me question if that 'limitless' promise is fading. Does the current economic structure actually allow for the kind of upward mobility that the phrase implies, or are we seeing a system where the ceiling is much lower than we remember? I'd love to hear perspectives from people who have genuinely built successful lives here, especially those who have seen the economy change drastically over the last decade.