Requesting advice regarding paper wallet

I have a www.MyEtherWallet.com paper wallet created in 2017. I have sent ether to it several times over the years up until 2021. Now I am having difficulty sweeping the assets. I have confirmed on multiple blockchain explorer sites that the balance is intact. I have tried probably 10 different wallet apps. They all fail upon inputting the private key, some saying it is an invalid format.

Any idea what might be going on? Any suggestions to recover the ether in this wallet?