Culturism is basically a product of the radical 1960s New Left and the negative reaction it got from the majority. The way to cure Culturism would be for the Left to acknowledge the Mistakes of the 1960s, and surrender that argument to the conservatives.
After that, we will have a unified culture again, and we can move on to discuss economic issues. From there, I believe Medicare For All and free college etc. will be much more easily done.
The Left needs to surrender most things on culture to (moderate) Republicans, after that they will easily win their economic demands.