Hi @krtagena · Thank you for reaching out.
The recommendation is to always keep break-glass admin account, by excluding one or more global admins so that you can revert the settings. However, if you forgot to keep a breakglass account, the only option is to open a support ticket and get data protection team engaged. After you provide evidence of your ownership of the tenant, they will unblock a Global Admin account for you.
-----------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.