I love the lemonaut.

Also, there is an advice I love, that can be applied to any genre: Do not write with the genre X in mind. Write what you want, pour your love in it, and let others label it. Maybe 'solarpunk' will end up not existing and will instead be dwarfed by a similar but different style, tidal romance, alt-earth utopians, skyships lesbian pirate slashfiction, whatever. Do not try too hard to shoehorn the themes of sustainability, it can simply be a background for the things you love.

Gibson hated the term "cyberpunk": he said he was just writing the science fiction that made sense to him.

If you are attracted to solarpunk, you have some thoughts and hope about the future but you are probably also into other things that you love. Make it about that.