I believe it’s important to not throw out the baby with the bathwater here. My belief is that much of modernism can be made such that people can thrive in it, but this simply hasn’t yet been a goal for the powers that be.
Much of the problems with cities for instance boil down to them being built for cars, not people. Simply replacing roads with greenery-laden paths for biking and walking would make cities much more conducive to mentally healthy citizens.
I don’t really buy this idea that’s been floating around the internet for a while now that humanity must return to thatch hut villages in the woods in order to be able to thrive.