Don't do this. Electrum servers are generally not setup to handle this many transactions in a wallet (most have a limit of 10,000 transactions in a wallet).

Your screenshot tells you exactly what you need to do. Your screenshot says that you can spend a maximum of ~4.91BTC (this is due to the maximum size each transaction can be). I would advise you to create/generate a new/fresh address and send ~4.85BTC to your new/fresh address, wait for one confirmation, then repeat. If you get an error message saying that you can spend a maximum of a lower amount, then spend some amount slightly below that amount.

edit: this process will cost you a decent amount of money in transaction fees, but I don't really see any other option to be able to spend all of your funds quickly.