First, check on the Block Explorer the status of your transaction to see if it’s unconfirmed, or simply hasn’t reached the necessary amount of confirmations to be valid by your recipient. For example, some services may require you to wait for 6 or more confirmations before considering the transaction settled.
Bitcoin Block Explorer: btc.com
Bitcoin Cash Block Explorer: bch.btc.com
If you are certain that your transaction remains unconfirmed, you can do two things:
- a) You can wait longer, until there is less congestion in the network, and miners begin picking up transactions with lower fees.
- b) Use a transaction accelerator service such as https://pushtx.btc.com/. Here you can “top-up” your transaction fee to become competitive. This can speed up your transaction substantially, with a high probability of getting it confirmed within 1 - 4 hours.