I was very clear with that I used Saffello which used Segwit before, but now Taproot (have no clue of the difference), is this the source of my problem - hence I'm f*cked?
The only problem is that the private key that starts with 5 doesn't support yet on Electrum but all private keys you have are uncompressed WIF private key you can convert them into the compressed private key that starts with L or K.
There is a tool that you can convert them you can use
https://www.bitaddress.org/ under wallet details and paste the private key that starts with 5 and you will see all details after you click the details. You can also use this tool
https://iancoleman.io/bitcoin-key-compression/ to convert them into compressed WIF keys.
Or you can try to disable or uncheck plain base58 when exporting private keys from the armory. Let see if it will show K or L private keys instead of 5.