grow something. Doesn't have to be via digging in the dirt (though that helps), even a houseplant or hydroponics setup or a jar of herbs on a windowsill can remind you that you're a part of the planet, not just a guest. And I think that mindset shift that comes with caring for greenery is of utmost importance.

This also scales: You can start out with a gardening kit or hydroponics kit, then you can maybe grow some herbs from seed on a windowsill, then one day you're hoisting up a grow light over some tomatoes in your bedroom and all the sudden you're growing food to feed yourself and your community. All very solarpunk in increasing intensity.

...the "growlight in the bedroom for tomato plants" might just have been a me thing though. (It didn't work so well)