This is wild speculation but I'm not even sure the Biden administration understands what people want at this point though. I see sort of the same problem in Swedish politics. Left wing politics has stagnated and doesn't understand how to win people over. Alt right is growing.

The major difference is that we don't have first past the post so even when our alt right party is second largest and the right is in government their influence is somewhat limited. They certainly get to ship their agenda but at least there are others in the room with a voice when they do.