It's gone once it passes one confirmation on the blockchain, the fact that you already accepted your mistakes takes us to another line entirely because at this point you should move on, and consider the excess fees as a donation to minners, next time before you send your transaction, you should make sure to check what fee average you are using and as a matter of fact you may have to manually insert that fees at some point to avoid this kind of mistake from repeating itself in the future.

Alot of time some wallets Auto inserts such high fees figures, it's left for you as the sender to manually correct the fees before sending your transaction into tge blickchain.