Already said two-thirds of what you posted.
If you still have some NOBL from way back in 2014 that might be a way to further increase the belief that you're the original account-holder.
This should be moved to Meta, by the way.
Also, the allegedly stolen account has no addresses posted and therefore OP is pretty SOL. Theymos said a staked address was the only way to prove account ownership (I'm unsure about Cyrus's stance on the matter but it's unlikely OP can conjure up some proof to show that they're the original owner)