If you haven't signed in to your account for more than two years, it may be deleted, so you can no longer reopen the account.
An inactive tenant can pose security risk if someone has unauthorized access. It's generally recommended to delete inactive tenants as soon as possible to mitigate security risks and optimize your Azure environment.
If you cannot create a support request via the portal, you can possibly create one via the global support numbers of twitter:
Connect on Twitter or Global Customer Service phone numbers
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Regards,
Abiola