Next time always check the Mempool stats to know what is the recommended fee with the current network before you make any transaction.
Use this tool https://jochen-hoenicke.de/queue/#0,2h then scroll down and look for "Mempool size in MB" use the mouse and it will show all fees including the size. Choose the fee always below 1MB in size. Sample today the recommended fee is 40+sat under 1MB below. it will take a few minutes or 1hr to confirmed depending on the network condition.
Since you use Electrum there are 3 different algo for fee estimation under transaction creation before you finalize the transaction.
Look at this image below.
I borrowed the image with little modification source: https://bitcoinelectrum.com/how-to-manually-set-transaction-fees/
The 3 options are these.
- Static = Fixed fee.
- ETA = Based on the average block for every 10 minutes.
- Mempool = Depends on the current Mempool size in MB of unconfirmed transactions.
What I recommend to you is always use the "Mempool" for fee estimation and it will automatically give you the recommended fee base on the size and current network condition. It always gives you the estimated fee below 1MB in size and based on what I experience all transactions that I made under 1MB in size always confirmed after 30 minutes but sometimes 1 hour and 30 minutes depending on the network condition.
If you want to learn more about the transaction fees with Electrum much better read this: All about transaction fees in Electrum
