@tg9 Nice story, but without proving that you are the owner of the account, we cannot do anything. Can you prove ownership by showing any information that only those who can access that account know, for example, details of PM messages or a trusted person on the forum that you communicated with, or any Bitcoin address that you can sign a message from, or anything?
I think the whole story of op is that he doesn't have access to his coinbase account where he used the wallet to stake his address here. Then again op is trying to make things too complex for him and if he still have access to account why not he continued using it than stirring cases which I think that is not necessary.
I tried checking through
ninjastic.space noticed the said account has many interaction with multiple wallet. Alternatively he can another wallet he has access to then maybe during his active days.