Yes, there is definitely a way to that. Bitfinex is indeed an exchange where you can sell your BTC for USD but as of the moment, I wouldn't advice you to do that. The reason is that Bitfinex is having problems processing their fiat withdrawals. If you sell your BTC in their exchange, there is a high chance that you will be able to withdraw your profit in USD. I would suggest you to use Kraken or Coinbase or other trusted exchanges out there that are currently processing withdrawals to fiat.