yhup probably that would be the reason why Op still don't have costumer up to now..and i think it will become more reasonable to have bitcoin as a payment if you're selling expensive coffee as well like" kopi luwak" which the price ranging between $100 to $200 because surely those rich people who loves such expensive coffee in your country will gonna visit your coffee shop and pay bitcoin and since they are rich probably they don't mind about the fess. Lol
Use LN if you want to pay for coffee at a lower price, it's a great payment option for smaller amounts with bitcoin. Although I suggest you use LN to pay smaller price with bitcoin but I have never tried it because my country prohibits using bitcoin as a means of payment. I have to convert bitcoin to fiat if I want to pay for something, so this is the reason why I haven't tried it yet.
Actually I also haven't tried whether Electrum can be used to send bitcoins worth $1-$2 with a transaction fee of 1 sat/byte. If that's possible then I think people still have the option of paying for a pack of cigarettes with bitcoin.