I want deactivate my account as I no longer use scratch. I was wondering if there is any way to deactivate or hide the account without deleting it.

I want my profile hidden and all forum posts hidden as well. I want to be able to log back in and reactivate my account if I want.

Is it possible to do this or do I have to export my projects and delete the account.

The scratch FAQ did, at one point, write something about deactivating your account, but it has been removed so I don’t know if that’s still possible.
Still, you might want to use the help center and find out