To deactivate Facebook account, follow the following steps:
Go to your Account Settings
Choose “deactivate account”
Fill out the form presented in the page correctly, and then click “Deactivate My Account” link.
To delete your account permanently:
Go to the delete my account page and click on the “submit” button.
Must read this - https://waybinary.blogspot.com/2021/07/how-to-delete-facebook-account.html