Life is not about class, it’s about money.
The problem is that nearly all the growth of the last 30 years has accumulated to the 1%.
This is the cause of the deterioration of life chances for those in the bottom 80%, while the top 20% coped better than the bottom 80%.
What would you expect?
The money needed to level the playing field to -say- 1950s levels of inequality has all gone to the 1%.
This was a result of policy choices, not of “the market” or technical innovation or a “skills gap”.
Get that money back from the 1%, reverse those policies, and the advantages the 20% hold over the 80% will shrink again.
Focusing on the 20% of the middles class is a diversion.