Electrum doesn't support lightning on old wallets with p2pkh addresses (beginning with 1). It only supports lightning on wallets with p2wpkh addresses that begin with bc1. So an upgrade wizard will not help.

Also the label sync plugin uses your master public key to find labels relevant to your wallet. A different seed will lead to a different master public key so you can't use the label sync plugin to get the labels of your old addresses in a new wallet.

Electrum does not support importing private keys in a deterministic wallet (a wallet with a seed) so you can't import the old addresses anyway. You can only sweep them.