Fortunately, it's not the end of the world for you, and all you can do right now is to not further the damage. Use peer-to-peer no-KYC exchanges like
The P2P platform that I am using right now has the option to delete the user account. But I am not sure whether all the data is deleted or not. Because the trust factor comes in to play here. There is no guarantee that they will purge all the user data, even if the account holder opts for that. There may be legal issues that surface later, and some of the exchanges would retain at least some information related to the users. The platform also claims that the communication between the buyer and seller is not visible to them, unless any of the parties opt for dispute resolution. If that is the case, then we don't have anything to worry. But once again, are they saying the truth and can we trust them?
They most likely do retain some data unless they themselves operate from some kind of underground corporate construct. It is similar to the VPN providers. I remember when a VPN provider claimed to not forward data to authorities, but it turned out that they were subpoenaed and handed out user data regardless. It may be true, but I would expect the worst using those platforms. Do you have to undergo KYC on that platform? I guess no? Because then it doesn't matter whether or not they delete it, you just could use false data. If they demand KYC, I would assume they also store some of the data without your consent.