You have to take /pol/ with a grain of salt. As someone that has lived in and out of California, the Californian migrant effect is real (just look at how Colorado is turning) but it's not a world-ender. Those rural deep red states are definitely still conservative, and thanks to our staggered government, it will take a while for the left to take full control. While the virtue signalling by the public mouthpieces is pathetic, polls and footage on the ground shows where most peoples' loyalties really are: their families, neighbors, and businesses. Even in New York and California you've got immigrants defending themselves in the city with guns, to say nothing of how well-defended our suburbs and small towns are. Even DiBlasio just said out loud a few hours ago that he wants New Yorkers to rise up and defend themselves; a stupid statement since he has spent so much time taking people's guns away, but it tells you how unpopular the rioting and far-left bullshit is.
The biggest hurdle these days comes from state-sponsored corporate censorship, the megacorps who want to dictate reeducation in their workplaces. But while that is a problem and not an easy one to fix right now, anecdotally at least I know there are still a lot of self-employed conservatives, whether it be trade work or programming/computer work from home. Maybe in certain cases leaving the country could be a net benefit especially if you can work remotely (e.g. average American wages are a lot in Poland) but the rest of the world isn't that much better off. Central Europe as you've mentioned is appealing in some ways, but the entire EU is teetering on collapse and who knows how that might turn out, especially as global markets move increasingly towards China/Southeast Asia.
tl;dr the world is going to have problems no matter where you go, but America still has some gas in the tank
