I would start or participate in your local community garden. They are solarpunk af! If they don’t already have it, an apartment composting scheme at the community garden.
As far as inside goes: maximising natural light and doing a balcony garden and filling the living space with house plants. Hydroponics is solarpunk. I would set up a wee fishtank nutrientcycler like they do in east asia. They look aesthetically solarpunk and help fertilise your garden…just make sure you get the right sized tank for the fish you choose.
Is there a way to add brands i want to avoid that aren’t on their list? I live in Aotearoa so I’m not sure if the list will have everything included