I think it's easier for you to set the price of goods, so fluctuations that occur in bitcoin or another crypto you can adjust the amount of Bitcoin itself with the price benchmark that you make with Fiat.
This is why many people say just put the profits into bitcoin and rest should be fiat, even if you sell it for bitcoin, automatically turn that into fiat and whatever is your profit, you could put it in bitcoin. In that case even if it drops, that was your money that you invested, and can wait longer to make more profit.