Hi and welcome to the MetaMask community
Just to be sure, when you say “MetaMask mining”, what do you mean by that? I think you mean that you have your MetaMask wallet connected to some ETH mining platform, but not sure.
You also say that you got a bonus of $300K, but before you could get it, you had to pay $92K. I’m sorry, but that sounds like a scam to me.
It sounds more like a problem between you and the ETH mining platform, than a problem with your MetaMask wallet, am I right ?
Do you have the address for your wallet ?