Sign in issues for a root user

What you are describing seems to be covered by this https://docs.aws.amazon.com/IAM/latest/UserGuide/troubleshooting_root-user.html

I don't have access to the email for my AWS account

If you know the email address but no longer have access to the email, first try to recover access to the email using one of the following options:

• If you own the domain for the email address, you can restore a deleted email address. Alternatively, you can set up a catch-all for your email account, which "catches all" messages sent to email addresses that no longer exist in the mail server and redirects them to another email address.

• If the email address on the account is part of your corporate email system, we recommend that you contact your IT system administrators. They might be able to help you regain access to the email.

If you're still not able to sign in to your AWS account, you can find alternate support options at Contact us.

If you have to navigate to the Contact us link, you are likely going to end up choosing Still unable to sign in to your AWS account which will send you to https://support.aws.amazon.com/#/contacts/aws-account-support/