Asia, specifically China.

I was in Myanmar a couple of years ago and was shocked to hear people wildly optimistic about their future — their lives had been getting better in significant ways literally month to month at that point. I’m not sure what they would feel now though.

I’m sure there are places in Africa where this is the case as well.

Look outside the West. While there's certainly lots of challenges throughout the globe, war and strife are much nearer in cultural memory in most of the developing and undeveloped world (and is often ongoing!) than it is in the West. Having Faith that tomorrow will be better is almost a prerequisite to life in most of these parts of the world, and you will often hear volumes of stories from parents and grandparents of wars, purges, poverty, and more.

Solar punk is a literature genre that attempts to do just this.

Metamodernism (of the variety described in "The Listening Society" by Hanzi Frinache) attempts to describe what comes after Postmodernism.