It's been about 4 years since I've played and this is probably a fruitless endeavor, but is there any shot at account recovery if I can't remember my username?
Yep, which is why I'm concerned about having so many accounts due to trying to figure out my username.
you are good then. I made a few extra accounts by accident as well trying to figure out my username. Telamon deleted the wrong user accounts (that I accidently created) and reset the password and told me what the correct account one was. All fixed up. edit - my wording made it sound like I said Telamon deleted the wrong accounts (as in his mistake), but I meant he deleted the correct "wrong" accounts that I had made (as in fixing my mistake)
Your best bet would be a PM to Telamon via https://discord.gg/9JtUTdP But even then his availability is patchy at the moment and nobody else can help with account recovery.