Interestingly, right-wing parties understand this quite well. If they loose an election you never hear that they have to convince moderates. Instead they get even more radical.

The other issue is that many of the issues that progressives are concerned about (e.g. climate change, inequality, gun control) require action by society as a whole. Ideally we would negotiate and find policies that address the priorities of both progressives and conservatives. However, that doesn't currently seem to be possible.

Please read the federalist papers.

I do not want the equivalent of a yellow vests movement happening here.

Gerrymandering is a huge issue, and it makes it so that moderates don’t have to exist because of safe districts.

The fundamental disagreement about priorities between the parties somehow turned into disagreement about facts in the past decade.

I believe that something like proportionate representation is a better solution. It would still allow minority populations (e.g. rural areas) to band together and get representatives elected that reflect their priorities. However, since the system is no longer winner takes all it promotes finding solutions via negotiation.