Thank you for asking this question on the **Microsoft Q&A Platform. **
Since you are the only Global Admin and have been locked out, you should raise a support ticket with Azure by a call
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. NOTE: To answer you as quickly as possible, please mention me in your reply.