Depends on the trend in your country and you can do any business and accept cryptocurrency as mode of payment.
With regards to direct crypto business, then you can study how to run an exchange, offer a services regarding cryptocurrency, do a crypto gambling site but those requires a good capital and further guidelines about the rules and regulations in your country. That's good to plan ahead of this one, we all know cryptocurrency is growing and doing business with it can be more profitable. Personally, If ever cryptocurrency becomes more active in my country then I will open a grocery store and accept cryptocurrency as one of the option to pay.