How to convert Ethereum PoW to USD?

Could you elaborate on the process of converting Ethereum Proof-of-Work (PoW) tokens to United States Dollars (USD)? I understand Ethereum has undergone a transition from a Proof-of-Work consensus mechanism to Proof-of-Stake, but there may still be PoW tokens in circulation. What steps would one need to take to convert these tokens into USD? Would it involve trading on an exchange? If so, which exchanges support Ethereum PoW tokens? Also, are there any specific considerations or risks involved in this conversion process that investors should be aware of?