In my country the price of coffee is so cheap that it is impossible to sell coffee using Bitcoin as a means of payment. If it is calculated, the transaction costs will be greater than the price of the coffee sold.
I think that's why you don't have any Bitcoin customers, nor do I know how much coffee costs in your country.
I prefer to sell something that is more valuable and has greater benefits, for example selling computer equipment, selling electronic equipment and selling household furniture such as (tables, chairs, cabinets, etc.)
I agree with you that bitcoin is not the best option for paying for purchases, as you spend almost as much on fees when you make small payments. There is also another important issue, which is the payment of taxes for the organisation. It is not clear to me how the government will regulate the purchases?