If constitutionalists move to redder regions and vice versa, we can push for de-facto secession by some states beginning to cut off most social welfare benefits, encouraging their moochers to move to a blue state that will be happy to support them.
Let federalism work. See how well rust-belt union states do under nearly pure Marxism. Let Texas become a libertarian republic. Etc. We should permit 50 experiments to happen, with folks voting with their feet. Takers will migrate to places that still hand out welfare to all comers. Makers will migrate to red states where hard work is rewarded.
At this point, the federal govt just won't permit this, but as its power declines with declining American power generally, they won't be able to enforce federal diktats in Alaska or Texas or even Tennessee.
Cuba.
One potential interim play would be to recruit large numbers of conservatives willing to relocate to purple states and turn them red. Conservatives that also prefer large families.
We won’t have to be concerned with forcing secession. Balkanization of the populace using full blown class and culture warfare combined with a complete economic meltdown will bring it to our doorstep. As you stated in so any words, the mob demographics have shifted under our feet against constitutional conservatism. The political party that claims to represent us continues to cave to leftists. We can rant and rave against liberalism all we want without effect. The mob in growing majority want their “free” stuff from the government and will continue to be willing accomplices in election fraud to keep those freebies coming. It’s going to take a massive crisis to turn heads around, and then only if enough conservatives are around and prepared to take control and reset liberty as we once knew it.