mdl.py

    def get_form(self, request, obj=None, **kwargs):
        form = super().get_form(request, obj, **kwargs)
        is_superuser = request.user.is_superuser
        disabled_fields = set()

        if not is_superuser:
            disabled_fields |= {
                'email',
                'is_superuser',
                'user_permissions',
            }

        if (
            not is_superuser
            and obj is not None
            and obj == request.user
        ):
            disabled_fields |= {
                'is_staff',
                'is_superuser',
                'groups',
                'user_permissions',
            }

        for f in disabled_fields:
            if f in form.base_fields:
                form.base_fields[f].disabled = True

        return form