The only way is to use the recovery via the email connected to the Bitcointalk account. If the email used is invalid or uses a temporary email, there is no other way to restore your account.
The importance of using a valid email but not a primary email, Email is specific to crypto use. Because if you use the main email, you are more at risk of receiving a lot of spam and some phishing links.
It is the only way to recover your account if you recover your account via an email address but there are other ways for recovery like your Bitcoin private key, Bitcoin message, PGG key and encrypted message.