I do see that your email is associated with developer accounts 6059473 and 6059474, however they are not nested inside each other like developer test accounts. Test accounts must be created inside a developer account.
If you wish, I can delete one of these developer accounts (please tell me which one), but I don't see a need to "start over" with zero developer accounts if you still plan to use one.
Please let me know if I have misunderstood your goal.
Okay, @adamwiggall, I've submitted a request to have developer accounts 6059473 and 6059474 deleted and am awaiting confirmation.
At this time, it's not possible for users to delete their own developer accounts. This question comes up pretty regularly, though, so I will continue to advocate for such a feature.