Here’s what I’d do if I were you.

• Install Bisq.
• Setup your accounts (whether that be Revolut, bank account etc., as far as I understand you want to withdraw for fiat)
• Copy a Bitcoin address from your Bisq wallet.
• Exchange the USDT for BTC using some service like fixedfloat (paste the BTC address there).
• Now just create an offer at Bisq to sell your bitcoin for fiat.

ou can refer to this list https://bitcointalk.org/index.php?topic=5461920.msg62640260#msg62640260 to check what’s available CEX that currently doesn’t require KYC but most of them is not that high confidence in terms of reputation.

Why not consider using DEX since there’s already P2P and AMM exchange that will cover almost same experience on CEX.