Then at some point in the last few months my account seems to have gotten banned, presumably from inactivity because I was barely using it. The user still exists on the site but I'm not able to log in and it asks me to email an address to get it unlocked.
I've sent a quick email to that address a couple of days ago, but no reply yet.
Honestly i don't know if it's possible to have ones account locked or banned because of a long time inactivities, but as your case maybe, if you're truly the right owner to the account, there are ways you could show and proof this, as already suggested above from previous comments, follow the steps and then if you still have access to the email used in registration for the account, it will be more better or if you have once signed a message on it before to prove your ownership.