My electrum has been stuck as "synchronizing" several times, especially recently and most frequently I have been able to clear the issue by simply closing electrum and then opening it back up a few minutes later. The issue started around the time the most recent "stress tests" we're starting so I suspect this was related.

I would suggest that you try restarting electrum, as well as restarting your computer, your router (if possible) and your internet modum (if possible). If none of these work then I would suggest that you create a new electrum wallet to see if electrum will sync with the fresh wallet (electrum will need to connect to electrum servers even if there are no transactions in order to check for transactions on your addresses).