The Username and secret question seem to be stuff I would never pick for a game but I got it 7 years ago so I can’t say I without a doubt didn’t pick them. I checked my current and Old email when I tried to reset and got no email. Tried sending an email for help and it seems unlikely to help.
I am no expert in ESO system however, if you are looking to play multiplayer, you always can use third-party programs such as, GameRanger. Link down below or you can Google it. I Hope this answer helps you
Correct, all the official support channels for AoE3 have been discontinued.