Hey everyone.
So I saw the 'Join a Social Club' reddit post and I think maybe the intent was not portrayed in the best way. I think what the poster meant was to join some sort of social group, they used social clubs as an example moreso on the networking side but I realize y'all are really focused on the social/dating side. (I see this subreddit pop up here and I've met a fair few aquaintances that lament the death of 'third places' or dating so here's my advice):
Join a hobby group. Something that you are even mildly interested in. Could be a salsa class you always wanted to try out or a poetry group. Go on Meetup or Lume, or just google in your city and find something. Now, do a bit of research, make sure its a serious group but one that has people your age (20s) and does have social aspects to this. (Cities are easier for this). And if you are looking to date, while it shouldn't be the primary thing, you should note if the ratio is healthier than say a warhammer group (assuming your a straight guy looking for women as an example). btw, people in their 20s are actively looking to date, so the idea that you should join a hobby group and not care about dating will lead you to failure. it is a thing that happens, dont make it the primary thing but dont forget about it entirely
Once you are in that group, after a few classes and presumably after some small talk and chatting with people and establishing your a regular interested in the hobby, go around and take the initiative to make a group chat for people your age. Im in a hobby group and we created a 20 somethings groupchat primarily to chat about our hobby but that also has branched out to much more things (going to cons together, hosting parties, movie nights, etc. etc.). And those friends you make in that group, they have friends too and social + dating opportunites cascade from this.
In my experience, I've found that generally, people in their 20s will sort of gravitate to other people in their 20s even though they have nothing in common in a hobby group with varying ages from 18-80. Your 20s is the easiest time to meet new people, make friends, date etc.
I have unironically created 3 different unique friends groups from this in addition to my college friends group causing me to have to bail on other commitments (not ghosting, I tell them well in advance) or schedule 3 weeks in advance for parties, movie nights, outings etc. (And it goes without saying yes I do meet women for dating in both the social hobby and the friends groups)
So go out there and join a hobby group, make friends, and go on dates. It literally will get harder when you hit 30 and up. People say date with intention but also make friends with intention, nothing will happen if you dont take the initiative. Feel free to ask questions etc. Y'all will do great i promise <3