Insufficient Funds

Hello.
I am completely new to METAMASK.
I deposited £50 into my MetaMask Wallet and then sent it to Matic Bridge V2 on the advice of an ‘expert friend’.
After realising that I had made a mistake, I tried to transfer it back to my ETHEREUM account.
However, now due to fees, I now have insufficient funds to complete a transfer and I can’t add any more funds to complete the transfer.
Can you help me please, as I appear to have lost my money?
Thank you.
Kind regards,
Steve Paull