List your useless shit on a buy nothing group. Chat with the people who pick up said shit and learn about their circumstances. If they’re not psychos/grifters, set up means to keep in touch. Repeat this process. Pay attention to things those people need/their circumstances, and connect people who can help each other. Encourage others you meet to do the same.
Keep it up long enough, and bam, you have the bones of a mutual aid group.
I’m talking out of my ass here, but hmm…
I mean we have at least two study trials, Minome in Manitoba in the 70s and the Ontario Basic Income Pilot Project in 2017 (though that one was cancelled after a few months due to a change in government).