I was literally in the same situation as you and recently was successful in recovering my account created in 2005.
I think what really helped is during the recovery process you're allotted space for additional comments. Dump as many details as you possibly can even if you are not 100% sure the details will help your case, write it in anyways.
For example, I struggled with my recovery questions so in the box I mentioned how my membership at the time was sporadic; on and off, on and off, for months on end because I would borrow my moms CC. She'd find out, Id borrow it again, she'd find out, rinse and repeat. That detail from 2005-2006 showed I knew what the accounts membership rhythm was like (active, cancelled, active, cancelled, every other month or two). Only the true owner would know such a detail. That wasnt the only thing I put in the comment box, just an example of things you should mention.
This post was edited by Shakti on Jul 27 2021 11:24pm