I am open to ideas if anyone has any (if resetting 98789's password is the way to go, I would at least like to read some sort of consensus that that won't cause additional "shadiness" to this process).
Actually it doesn't matter, if I were you then that would be the first thing I'd do without opening a new account and starting a topic as if everyone cares about me. After all you still have access to your old coinbase wallet, even if you can't prove ownership with that address, people won't question it if you reuse that address for your business on this forum.