The owner email id has been deactivated. and we dont remember the owner log-in credentials. How can i change the owner access email id?

This is my page URL :
we are using ghost version 4.3.3
we installed ghost with hosting our site on cloudflare.
i am not sure about the node version. but we are using MySQL database,windows OS & chrome as browser.

Email id of owner access of ghost platform has been deactivated from our system & i don’t remember the password of the owner access.
How can i change the owner access and add new person as new owner to our ghost site.
Please help me. its urgent.