It’s hard to write to an aesthetic that is this utopian. You’d have to be more realistic about it. What would the conflicts be? What would criminality and/or corporate (or other org) malfeasance look like? What sort of culture wars might exist?
But don’t make it a green Aesop. That’d be boring, and the whole point is that those problems are mostly solved. So what are the new problems? Make it an original conflict, maybe something we wouldn’t even imagine.
I agree that its new problems and challenges that will make the genre interesting. Even in a utopia there's a lot of room for conflicts, and not all of them need to be original conflicts, but hopefully we will see some new ways to address old conflicts within a utopian framework.
It's precisely the utopic part that's an issue. All other punks before it like dieselpunk, cyberpunk, atompunk etc are dystopia. To make solarpunk actually interesting, we have to be willing to discard the escapism and consider horrific consequences that we may face if we actually try to implement it.
But don’t make it a green Aesop. That’d be boring, and the whole point is that those problems are mostly solved. So what are the new problems? Make it an original conflict, maybe something we wouldn’t even imagine.