[HelloMcFly]

Optimistic scifi properties:

* The Long Way to a Small, Angry Planet by Becky Chambers (+ sequels)

* Monk & Robot by Becky Chambers (+ sequel)

* Most of, but not all of, Star Trek. This is getting infected with cynicism in some places, but still largely optimistic about a utopian future.

* The Martian by Andy Weir

* For All Mankind on Apple TV+

* Arrival movie

That's what I can think of since the 90s. Doubt it's a complete list, but really Becky Chambers is the optimistic voice in the domain, primarily since she focuses her works on interpersonal vs. galactic or societal dynamics.