I am not an OKX user and I don't know if they require KYC from all users or not. If they do not ask for KYC, then it's okay. You can use them. But, if OKX also asks for a KYC, I wonder why you need to use a less reputed Centralized exchange when you have better options already. Once you have already KYCed on an exchange, that means you do not have a problem with KYC. If so, I recommend using Kucoin or Binance as they are well known. But, If you can refrain from using any of them, it's better for you.