Basic 2% rewards credit card. Don't care about rate, since I would pay it off every month, per usual.
Discussion
To clarify, keep the earned fiat in bitcoin and pay the credit bills from that balance every month (Strike handling the exchange to dollars and the tax reporting documents)
Keep in mind it would be better to use Bitcoin as collateral for the credit instead of selling the Bitcoin, but the banking system in the US won't let you. There was a Nexo card in Europe that allowed crypto collateral but they never supported Monero and I'm not sure what happened with them (probably still operating)
Gotcha.