I don't think a civil war could work really. The ones that might want to do it tend to be in rural areas. What are they going to do with violence?

At the same time, the Republicans are working as an insurgency from within. The problem is that the Trumpers have found a weakness in the election system. Trump has even told his followers that it doesn't matter if they vote. If enough Trump loyalist election officials simply refuse to certify the vote, the election will fail and then will be conducted in the State Houses with each state having one vote. The republicans have a majority there... even if 35 million more American's vote for Biden, Trump could legally become President. They have a well documented plan of what to do then: Project 2025 and they have the people ready to take over all levers of government... and no one is going to get it back after that. The Constitution will be re-written as well to make sure.

Revolution, not civil war.