Before sending Bitcoin from Electrum wallet you should check mempool and set your fees manually or you can try switching from default static fee to ETA fee or Mempool option.
There are a lot of transactions in mempool now, so you can wait for network to cool down or you can bump and increase fee for your transaction if you used RBF replace-by-fee option and if you need faster confirmation.
For more information you can read the Guide How to cancel Bitcoin transaction.