From my experience Gen X are much less 'clubbable' than those older than them. In other words, much less interested in social groups than in action groups (with a small 'a')
Am example: For the last 45 years I have been an acive member of my county archaeological society. I have filled most roles on the committee.
When I joinedthe society, we essentially ran a monthly lecture series, arranged visits to archaeological sites in the summer, and had other activties based on us being visiters, watchers, listeners.
Over the years as members died, our numbers dropped and we were not recruiting from Gen X, then someone, boomer generation, joined, who was interested in doing archaeology, as a result we now have a very active archaeological fieldwork group and the society is thriving again. Most committee members are now the younger generation.
So if you stay just a social group, you will be come passe, and fade, start doing things and you may start recruiting.