If you really play on bc.game using VPN, this simply means their system must have recorded that you are playing from a supported country, I think the only possible solution here would be to move to that country where you often visited and played on the casino from, when you get there, you could settle down and try to get a government issued document in that same country, get every document required to successfully pass the kyc verification and try verifying your account again.

I won't advice any one to buy this account from you because the buyer may still be unable to access this money due to several reasons which is obvious, if the money on the account means so much to you and you can afford to travel out of the Uk, your best bet would be to travel to the country you often played on bc.game from, if this doesn't still work, then simply forget the money and learn your hard lesson..