Building more diverse local Organized Play RPG community

How do I build a more diverse local RPG community? Currently, there’s several Organized Play RPG communities in my closest metro region (West Coast, USA). The largest OP group has several thousand members and a very broad, diverse demographic base with members from almost every social facet of urban life.

There are a few other OP groups that are far smaller and insular. From my observation, these groups are almost entirely ethnically white, middle-aged men. These groups range from 50-200 members at most.

I am an active member in multiple Organized Play groups, and there is a glaring difference in membership and demographics.

How do I help build an Organized Play community that doesn’t become insular and homogenous? I don’t know if a reformation approach is helpful or appropriate for these groups, but I’m not willing to accept the status quo.