advice on role management in django

[cosmos multi]

I am trying to work with a role system that allows from the user registry, select the role to which you want to belong, the problem is that I do not get the best way to do it because when I want to do validations it generates many errors, investigating a bit I realized that the groups are more efficient in this sense or well I think so, if someone could give me some advice and a link to an example of how to handle this I would be very grateful.

this is my code

class Usuario(AbstractUser):
	is_administrador = models.BooleanField(default=False)
	is_satelite = models.BooleanField(default=False)
	def get_administrador(self):
	administrador = None
	if hasattr(self, 'administrador'):
	administrador = self.administrador
	return administrador
	def get_satelite(self):
	satelite = None
	if hasattr(self, 'satelite'):
	satelite = self.satelite
	return satelite
	def __str__(self):
	return '%s %s' % (self.first_name, self.last_name)
	class Meta:
	db_table = 'auth_user'
	class Administrador(models.Model):
	usuario = models.OneToOneField(Usuario, on_delete=models.CASCADE)
	imagen = models.ImageField(null=True, blank=True)
	razon_social = models.CharField(max_length=30)
	class Satelite(models.Model):
	usuario = models.OneToOneField(Usuario, on_delete=models.CASCADE)
	imagen = models.ImageField(null=True, blank=True)
	nivel_acadademico = models.CharField(max_length=30)
	def __str__(self):
	return str(self.usuario)
	@receiver(post_save, sender=Usuario)
	def asignar_rol(sender, instance, **kwargs):
	if kwargs.get('created', False):
	if instance.is_administrador:
	Administrador.objects.get_or_create(usuario=instance)
	elif instance.is_satelite:
	Satelite.objects.get_or_create(usuario=instance)