Fixing ewaste computers and giving them away. Finding furniture on trash day, fixing it up (sanding, staining, urethaning) and giving it away. Helping my neighbor clean out his house and putting the stuff on our local Buy Nothing -type group so it doesn't go to waste. He also was interested in turning his lawn into a garden and our landlord won't let us change ours, so we teamed up with our neighbor - this year we built a (I think) nice-looking raised bed full of perennials for the bees, and planted a fruit tree. Next year we're going to do the back yard and possibly add a water feature hopefully driven by a used solar panel. We'll see.

Edit: I don't know if making art counts as praxis but I've also been making solarpunk art: https://jacobcoffinwrites.wordpress.com/postcards-from-a-solarpunk-future/