In the menu at the top right: select My WikiTree --->Settings. From there you can choose to opt out of notifications.
Your profile is set as private. If I understand WikiTree correctly, whatever is contained within the bio will be hidden from view for generations, but your first name, last name and year of birth will remain, unless someone in the future adopts your abandoned profile and changes the first name and date of birth to identify another Callebaut. I do not have a clue regarding what happens to a bio that should remain private, so my presumption is it will not be present if “your” personal profile is adopted in the future. I do know that for profiles I've adopted, the biographies were present, but those profiles all were for people born some 200 years ago.
Persistence of data on social media sites and other website databases is a vexing issue. We supply the data, but cannot control its destiny.
