Do you remember if what version of Electrum you used before you updated it to 3.3.8? Take note if it was from 3.3.3 or below version they are infected with phishing so if it shows a notice and forcing you to download the latest version and click the link you might be phished.

Or if you believe that it was from a different derivation path there is a tool that can scan all derivation paths and scan for used addresses with balances.
You can find the tool here https://blockpath.com/wallets/local/101?action=appxpub

Just open the Electrum wallet and look for wallet information and then copy the xPub and paste it there to scan.

Once it shows all used addresses and balances on the left side you will see the right derivation path of those addresses.