Actively participate in leftist organizations and events.

Join an active chapter of a socialist organization even if you don’t 100% agree with the organization, particularly at the national level, because local levels differ and there are relatively few of us. You’ll probably run into a wide variety of leftists depending on where you live and what organizations are established in your area.

Join labor workshops, mutual aid groups, or anything that aligns with leftism and you’ll end up meeting people who are leftists.

this is something i’ve learned in my experience over the decades, which means it’s anecdotal and probably wrong:

leftists are like cats: they do whatever they want whether or not other leftists agree with it; they sometimes have circles of other leftists that they get along with; and will be aggressive towards any other leftist who isn’t already part of that circle.

someone taught me that leftists today operate like native americans and their chieftains in the past before the american settlers turned the chiefs into war leaders and forced the surviving populations to live in reservations: leftists mostly don’t recognize a leader and “walk away” rather than follow direction from any majority that tries to impose their collective will onto them; like the natives americans in the plains, the south east, the pnw, and the east coast used to do; but they do have figures/people that they respect and follow (aka their chiefs) so long they don’t try to impose their wills on them.

it was sort of like a “live and let live” groupings of societies back then and leftist seem to have copy/pasted it for themselves and so having difficulty reaching out to other leftist is natural due to the way the majority have forced us to live.