Are you planning to send all Bitcoins from your wallet?

It seems when you are making a transaction from Electrum you are paying a large fee. The reason behind your problem is due to network congestion look at the Mempool stats below.



This why the transaction you made is asking for a large fee.

Anyway, can you enable this



You can find it on tools>Preferences>transactions then enable advanced preview.

Now make new transactions again under send tab and paste the address you want to send BTC and manually put the amount(don't put the maximum amount sample you are going to send 0.02BTC) and then click "pay" it will show the transaction creation tab.
Then look for this below.

now from "ETA" set it to "mempool" and use slide to manually set the fee.

Since you said there are 8 outputs from the coins tab the fee should be around 0.00151440BTC based on the current network and estimated size(Coinb.in/#fees).

Now click finalize and let's see if you can able to broadcast the transaction.

8 inputs, 2 outputs @ ~100 sat/vbyte should result in a fee of ~0.0013 BTC
So this doesn't really explain your problem.

Do you see the feerate that's being used?
The problem must be one of the following:

• An incorrect feerate is being used
• No all unspent outputs are being used as an input for your new transaction

Maybe a dumb question, but you're running the latest version of electrum, checked the signature and you are connected (a green button is shown at the bottom right corner), right?

Quite the opposite... By going to the address tab, or the coins-tab and selecting "spend from" or "spend" you are activating coin control. By activating coin control you'll only be using a subset of the unspent outputs to create transactions, hence you won't be able to spend the total value of your wallet.

You'll know when you're using coin controll because there'll be a notice at the bottom like this one:



You didn't answer my question tough: did you use this wallet to collect faucet payments (or other micro-payments)?

Try to check for the txids on your electrum wallet, check if you authorized for all. Most especially, the last transactions.