~snip~
Let me ask if what wallet you currently use to send this transaction?
You can maybe make a double-spend transaction and increase the transaction fee.
If you are using Electrum you can follow this method below.
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TUTORIAL - How to fix Unconfirmed Transactions!the transaction is already confirmed but for future reference, the post you linked is not the way to "fix" anything when the transaction is not marked as RBF which OP's transaction isn't since it has max value for its sequence for its only input. since the transaction is properly propagated even after all the effort of messing up the wallet file and removing the tx and creating a new one, all the nodes out there reject the new transaction since it would be a double spend.