You need to talk to those who know the value of cash. Small shops, farmers, restaurants and craftsmen. Also it helps to introduce them to Monero as well. Bitcoin to store value and Monero to accept digital cash with ease. Forget about chains or big supermarkets. They are the result of the fiat economy and will be the last to adapt.

I asked the owner of a cafe who had a "no cards, cash only" sign. He said it wasn't worth it for the remaining season.