Republicans are so much the party of individualism and freedom these days that they are no longer the party of community and order. This puts them out of touch with the young, who are exceptionally community-oriented. It gives them nothing to say to the lower middle class, who fear that capitalism has gone haywire. It gives them little to say to the upper middle class, who are interested in the environment and other common concerns.
The Republicans talk more about the market than about society, more about income than quality of life. They celebrate capitalism, which is a means, and are inarticulate about the good life, which is the end. They take things like tax cuts, which are tactics that are good in some circumstances, and elevate them to holy principle, to be pursued in all circumstances.
The emphasis on freedom and individual choice may work in the sparsely populated parts of the country. People there naturally want to do whatever they want on their own land. But it doesn’t work in the densely populated parts of the country: the cities and suburbs where Republicans are getting slaughtered.