ViaBTC still works, but fills up in a few seconds every hour.
If you can manually go through your inputs, you can select which ones are worth using at current fees, but I don't think Electrum allows this. If you want to go full Bitcoin Core, you can import your private keys, download the full blockchain, enable coin control features, and go from there.
I would just wait it out until
fees are much lower again. Fees already dropped 85% from the peak last week, if it's low enough you can consolidate your small inputs without paying $400 on fees.
I can't emphasize enough how important it is to consolidate small inputs when you can, instead of keeping them pile up until they're worthless due to high fees.