Adding to ranochigo's comments; assuming you have 100 current inputs in one or more addresses, and you're limited to 20 UTXOs per transaction, you can turn those 100 UTXOs into 5.

In Electrum make sure you have your addresses tab and your coins tab visible.  On the menu bar select View>Show Addresses, and View>Show Coins.

From the Coins tab you can select one input to spend, or more multiple inputs to send together.  From the Addresses tab you select a specific address to spend from.  Also from the Addresses tab you can select an address you want to use to receive the inputs.  You can send the inputs the same address they are coming from, another used address, or select an unused address.

Once you've decided on the inputs to consolidate, send them all to your chosen internal address with the lowest possible fees; 1 satoshi per byte.  Then once all the applicable inputs have been consolidated you can send the consolidated inputs to the recipient.  You don't have to wait for the transactions to confirm, the default settings in Electrum allow to spend unconfirmed transactions.  If you sent them all to the same address you can select that address from the Addresses tab and send the desired amount to the recipient.  This method is referred to as Child Pays For Parent (CPFP.)  To help pay for all the parent transactions you'll want to use a slightly higher than normal fee for the child transaction.  Make the fee appropriate for your spending needs, then add a few more sats/byte.  This method should help you save a little bit on fees.