Missed this the first time, but there’s plenty of places where you can exchange Raven for Bitcoin, then you can sell BTC for cash. There’s a list on their site of exchanges: https://ravencoin.org/buy-ravencoin/
Personally, one that I like that isn’t listed is StakeCube. Not sure how much liquidity the RVN market has on there, but they have essentially no KYC or fees to transfer out coins currently. Of the ones listed, I’ve personally used Graviex and it seems to also be a reasonably reliable service.
Anyhow, as people mentioned previously, you sign up for an accout and send your Raven to the exchange. Then, you put it up for sale or sell it at market price for BTC or Eth. Transfer the BTC/Eth to Coinbase or Gemini and sell it for USD, then transfer the USD to a bank account. If you end up going with a particular exchange, they probably have some help documentation on use their service, though most of them are pretty identical.