Where do early-stage founders “hang out” before launching publicly? (i will not promote)

Hey everyone! I’m a brand and web designer (not promotion my business or anything, just looking for information) and I work with new startups, especially those with female founders or diverse founding teams. I’m trying understand better of where founders or future founders “hang out” so I can reach them before that hire someone else to do their branding for launch? How do you go about choosing the right designer to work with? Any insights would be super helpful! Ghanks in advance