Hmm... so... do you really have a balance of 331831 BTC in your wallet? Something doesn't seem right here. Where did you get this wallet from?
Is this really an Electrum wallet? I see it has a ".dat" extension (or that's just its name) on the wallet file, which would be a Bitcoin Core wallet.
This is exactly my thoughts about the OP's issues here. I mean you own a lot of
BTC and it seems that you don't know how to even import or sweep your privatekey in other wallet software? Something is not right here, just saying.