Does your transaction have a change output back to one of your own addresses? If it does, then you can use this change output to perform a child pays for parent transaction to speed up the confirmation of your first transaction, even if your current wallet does not support RBF and you have not enabled it on your unconfirmed transaction. Essentially, you send the unconfirmed coins in your change address to another address in your wallet that you control, and pay a much higher fee for this second transaction. Miners who want to pick up the fee for the second transaction will have to confirm the first transaction at the same time, and so both your transaction will be confirmed in the same block.

If you tell us what wallet you are using we can guide you through this process. If you can share your transaction details, then we can calculate exactly what fee your second transaction should pay.