https://kloudcommunity.blogspot.com/2019/03/recover-and-manage-trailhead-account.html. Please check the above link.Hope you will find the solution. Thanks&Regards Brahmanaidu Mandalapu
If you can’t log in to your Trailhead account (i.e. you said yes to all of the above), you will need to create a new Trailhead account. Once you’ve created a new Trailhead account, submit a case with us and provide as much detail as you can (i.e. full name on both accounts, email addresses related to the accounts, profile ID or URL, etc.)
https://kloudcommunity.blogspot.com/2019/03/recover-and-manage-trailhead-account.html.
Please check the above link.Hope you will find the solution.
Thanks&Regards
Brahmanaidu Mandalapu
If you can’t log in to your Trailhead account (i.e. you said yes to all of the above), you will need to create a new Trailhead account. Once you’ve created a new Trailhead account, submit a case with us and provide as much detail as you can (i.e. full name on both accounts, email addresses related to the accounts, profile ID or URL, etc.)
Refer this link
https://trailhead.salesforce.com/help?article=Lost-access-to-my-Salesforce-User-and-Trailhead