It appears the account hasn't posted since then, but there is a possibility that it tries to pm people to scam them. You can try account recovery using secret question if you set one up, this will lock the account.
Never set one if my memory serves me right
There has been warnings on email security, but it's been a while I saw them. You made the mistake of using a promotional email address. The email providers likely transferred all previous data when the account was retrieved, and the new owner saw some bitcointalk related mails leading them here.
Do you have any other accounts linked to that address?
My memory sucks, but I believe the only account linked is the one from blockchain.info, but even that required a password to login and the balance is on zeros anyway.
You first used the Bech32 address bc1qc7k8... nearly four years ago, and it appears you've consistently used it for DCA-ing since then. Given this history and the absence of previous account issues, I believe it's reasonable to assume you still control this address. So, I think there's no need to sign an older one.
Cool, that saves me some effort.
By the way, congrats on finally consolidating those inputs! It was about time, right? You could've saved a few bucks if you'd done it earlier, but hey, better late than never.
LOL, it took me forever to consolidate my inputs, but I do not like to touch my wallets unless I absolutely have to.