Growing food and addressing deforestation and climate change with like-minded neighbours, while consuming as little as possible from the commercial cesspools of the world, is what I consider a realistic approach to solarpunk, at least for me. I've not found long-term neighbours who share the same goals, but I've met some cool people, and I continue to plant fruit trees and find ways to use natural materials from the forest rather than buying something. I cannot manufacture electronics or forge steel tools, but otherwise, in the long term, I could pretty much live off of the land with the help of the occasional volunteer who has construction experience.
Living vegan (choosing total liberation for all sentient beings) and refusing to accept the cyberpunk dystopian world of non-free software are also major aspects for me; solarpunk is anti-oppression. Many people seem to miss that part, but to me it is crucial, and it is what makes solarpunk appealing and sets it apart.
I'm not so optimistic about new energy technologies, but old-fashioned water-wheels and such are still just as viable as ever, and in the long term, I foresee a return to (modernised/improved versions of) such technologies being useful.
As other commenters have pointed out, community is an important aspect of solarpunk, and it seems like it needs to be a major aspect of any anarchist movement, as "we" are greatly outnumbered by those who support the status quo, and we will need to support each other in order to achieve a lasting cultural shift on even the local level. There are already some vegan intentional communities and regenerative neighbourhood projects and food forest projects and even explicitly solarpunk communities making an effort to bring about a more ethical and sustainable world, and anyone looking into aligning their lifestyle with solarpunk values might consider joining one or starting their own when life in the city reveals itself to be untenable.