There are occasional times we all go to more densely populated areas. Maybe for business, or to buy something, or to visit someone. When you make that trip, schedule a meet up with a local person to buy crypto for cash. Simple.
I wouldn't even know how to get in contact with people like that, not outside of meetup events themselves. Plus, with the eternal hodling some Bitcoiners do, it decreases the chances of finding people that would be down for trading paper fiat for BTC.