My email has not changed since then.
Thank You all for the replies! I'm really hopeful to post again here using my legacy account.
The account does not have a password or email change log. If you still have access to the email account, you should be able to request recovery of your account via email.
If you still have access to the Bitcoin address that you posted previously, you can sign it as strong proof that you are the owner of the account.
The Bitcoin address you posted looks like it last made a transaction in 2016. That's quite a long time ago, but hopefully, you still have access to it.