Freemasons: what do they even do? I just know a few secretive fat white guys who belong. They're serious about it. They don't talk about it. Why would I join? I have no idea what they do. Not obviously recruiting in my area.
Boy/Girl scouts: I wasn't able to have a kid and so couldn't volunteer here or sports. It's kinda creepy to do so without a kid. Not obviously recruiting in my area.
YMCA/YWCA: this seems like a straight up company these days. Do they even take volunteers? I don't see any recruiting for it.
Kids who code / other code bootcamps: sent multiple emails. All I got back was marketing asking for donations if I even got that. They did like 2 events a year.
I do volunteer EMS/Fire/Ski Patrol... That requires actual training. Groups were obviously recruiting once I had the skills. They need people to help run large events / medical.