Without knowing anyone connected to a mining pool, all you can do is rebroadcast the transaction. Since you will be paying that person, it is better to use a wallet that supports RBF and rebroadcast the transaction instead of searching for a mining pool.
The only mining pool that provides an open service to everyone is ViaBTC, but with certain conditions. You can ask in the mining pools section here if there is someone else who can help you, but it is a waste of time. Switch to a wallet that supports RBF.