How can I meet other people like me?
BTW, did you consider applying to YC? You don’t have to move permanently to SF to join.
Do you really want to restrict yourself to meeting people in their 20s ? If you expand your horizon a bit, plenty of exciting founders in their 30s,40s or even 50s .
Maybe the institutions near you do the same, I am sure your input would be invaluable there and also the (future) founders would be right in your age range.
You can try milling about various startup accelerators, I guess. You might find a few who did what you did, and they tend to have a younger crowd.