One thing that I think is probably a large impact has been an increase in general strife. Online arguments and division often among political and ideological lines combined with trends away from any sort of national identity or cohesion.

ex: 50 years ago, everyone had seen at least an episode of "I Love Lucy" which was the most watched show in the US. With only a few networks and some very popular culture there was more cohesion. Even with political discourse it was often presented in a much less polarizing way.

I would also point the blame at a lot of what I can only summarize as excessive internalized guilt. Often over things you, personally have no impact on. As well as trends towards coddling anxiety. Where the only true way to get past anxiety is to do more of what gives you anxiety, whatever it takes to actually do that.

I'd also say that "rich" is largely subjective, and common, regular expenses have become extremely burdensome this past few years... If you look at the pricing trends in fast food, it seems to have really ramped up since around 2018-2019 and over the top during COVID... far more than inflation alone can justify, and I think is mostly plain greed. People feel squeezed out and it's hard to overcome.