Pending transaction can't be stoped with nonce

Hello, I tried to change WETH to ETH my transaction got “stuck” and I first tried to upgrade it and pay the higher gas fees. This didn’t work either so I tried to cancel the transaction, when I received a error message “transaction failed”. Now the transaction is still pending and I cant stop it.
I tried the trick with adjusting the nonce, but unfortunatelly even though I activated it in the settings, the option is still not available once I want to send a transaction.

Can anyone please help mit with that Issue?
Thanks a lot!!

I’m on metamask version: 9.4.0