Is it possible to find my old icloud email-adress back which I lost with disconnecting the device I created it on?

 I had an old ipad connected to my account with an icloud email, I only recently remembered that I need this email for some logins from important accounts that I loged out of and can't get back in.

The problem is that I can't remember it and that I can't find it back. When I look in my settings it states that I have no icloud email. I tried online by giving my phone number to see what email connects to it but I got no results.

The old ipad is fully reset and is disconnected from my phone, other devices and account.

Can I find it back?