I found a site claiming to have paths to do it and you could search, a fee calculator, but it was way outdated as it had bitcoin price at about 5k. It also said to use Coinbase Pro which had no fees, but I'm pretty sure that loophole is closed now.
Another site claims Bittrex is the best way, to transfer your BTC into Bittrex and then convert to USD and withdraw to bank.
Another site says to convert Bitcoin (BTC) to Litecoin (LTC) or Stellar Coin (XLM) and withdraw through Coinbase or your preferred method.
Another suggests Gemini.
I'm also concerned about "spread" which while they claim it is to "protect" you, let's be honest, it's there to wait a few days to pick the best price for THEM so they can steal the most fees and make the most profit off your money.
What is the best/cheapest way to withdraw Bitcoin out to USD, one way or another?
Coinbase pro and Binance US are the best exchanges out there but you can't say they have less fee but compared to coinbase it is cheaper. If the amount is small and willing to accept other payment mode like Paypal then you can use peer to peer platforms which has no KYC also.
I don't think you need to convert your btc to another coin if you want BTC straight away because no matter which coin you sell for fiat the procedure is same with bit more time.
Seems to be wrong because I know for a fact you can get way lower fees by first switching to XLM in coinbase based on multiple other people saying similar. Also, P2P exchanges often do have KYC.