Django how to rename already loaded ImageField images?

Question

Django

Changed the Model field with ImageField image upload field

image = models.ImageField(upload_to=motor_image_rename, default=None, blank=True, unique=True)

added a function to rename them and place them in a specific folder

def motor_image_rename(instance, filename):
    ext = filename.split('.')[-1]
    name = slugify(instance.motor.brand.title),slugify(instance.motor.title)
    filename = "%s.%s" % (name, ext)
    return os.path.join('motor/{brand}/'.format(brand=instance.motor.brand.title), filename)

The question is how to apply it now to those pictures that have already been uploaded? So that they are renamed and moved to the desired folder