To recover an inactive Gmail account, quick action is critical. Google’s policy states that if an account remains unused for 24 months, it may be deleted, including all emails and data.
If it hasn’t reached that point, you may still recover it. Start by going to Google’s account recovery page and entering your inactive Gmail address. You'll be guided through questions to verify your identity—such as old passwords, recovery email addresses, or phone numbers.
Use a device you've previously used to log in for better chances. If you succeed in proving ownership, Google will reactivate your account. After gaining access, immediately update your recovery settings, change your password, and review your security activity. To avoid deactivation in the future, log into the account occasionally. Recovery relies heavily on the information you’ve provided in the past, so always keep your account details up-to-date.
Timely attempts give the best chance of restoring access.
Read complete article here: