Do you know if its your address you see in the addresses tab?

I'm thinking it's likely you've imported the wrong type of address.

According to the link I'll put at the bottom of the screen you might want to add lines of:
p2pkh:private key
p2wpkh-p2sh:private key
p2wpkh:private key

And see if this improves anything once it connects.

https://btcleak.com/2020/06/13/import-all-private-keys-in-electrum-the-right-way/