You could try importing the private key into some other wallet and creating a replacement transaction with a higher fee.
But, will that Tx with high fee propagate unless the previous one is dropped by majority nodes?
That depends on how low the original transaction fee was, and how long it has been since the original transaction was sent.
If the fee was very low, then the majority of nodes may not have every heard about it.
If the transaction was sent a long time ago, then many nodes might already have dropped it from their mempool.