Can’t log on to my account…

I've changed and forgotten my password on my email account I've had for about 3 years  and can't access it anymore. I've tried too many times guessing it. Tried sending reset emails but those accounts are parent emails and are not accessible anymore. Also have tried filling out the questionnaire survey filling out as much information as possible but wasn't successful. I can provide old passwords, recent emails, names of private folders, linked mobile phone number to prove it's my account.

I've made this account  to get help.

Any help would be greatly appreciated, thanks.