Most big groups have monthly “welcome sessions” that are a great way to feel things out if you’re not sure.

Lacking the scifi vibes of solarpunk, but I massively recommend joining your local greenpeace (or friends of the earth, extinction rebellion etc, depending on location) group!

I’ve only attended a few events so far, so not an expert or anything, but meeting with an IRL community based on protecting the environment is really great for making a difference, but also mental health in avoiding doomerism.