Thank you for asking this question on the Microsoft Q&A Platform.
I can understand your frustration
If there is no another Tenant admin user and your user has been locked out, you should raise a support ticket with Azure.
Global Support Phone Numbers - https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 (here you can find the number of the support teams of your region)
Hope this helps!
Accept Answer and Upvote, if any of the above helped, this thread can help others in the community looking for remediation for similar issues.