The happiest Gen Z I see are the ones that go to Church. Being religious is a bulwark against nihilism. And Church youth / under 30 groups are basically marriage express lanes, which takes the App /hookup culture hell out of the equation.
Thats a bit of a strawman. Will religion pay your rent? Probably not. But focusing on a simple life around family and charity and not chasing material possessions or luxury might. Changing priorities from hip neighborhoods to family friendly neighborhoods may.