What country did you choose or specify during account registeration? If it's the same UK you choosed, and right now, you have to sell the account to a known UK person, then who ever buys the account will be in a big risk of having the account locked permanently as the management could notice or find out the account changed hands.

I don't know how much this money is worth to you but if I am really in your shoes, I did consider moving to a different country and region that is on bc.game whitelist, I will settle down there and do all I can to get a government license document supported by bc.game, and the think the simplest one to get would be a drivers license, with this, I can pass the advanced kyc verification and withdraw the money from the casino simply close the account.