How to use RBF (Replace-by-fee) on Electrum
For those who are not familiar with RBF (Replace-by-fee), it's a feature that allows you to replace an unconfirmed transaction with another one that pays higher fees.
If RBF is not enabled by default in your Electrum wallet, you can turn it on by going to the Menu -> Tools -> Preferences -> Transactions.

By doing this, you can later accelerate your future transactions if they ever get stuck or cancel them.