To piggyback off someone else's idea, Technology Connections has some neat videos on passive thermal management of his house through things like blinds, awnings, and paying for power intentionally at off-peak hours, that are kinda solar punk

I wish I could remember more of the strategies he talked about, but reducing your energy load and improving power efficiency leaves more energy for other people and things :)

I think that's a fairly solarpunk idea

A countertop composter to reduce waste would be another idea, and could help you grow things like herbs if you want an application for your compost