Inject ConfigFactory to service

use Drupal\Core\Config\ConfigFactoryInterface;

...

/**
 * Configuration Factory.
*/
 protected ConfigFactoryInterface $configFactory;
 
/**
 * Constructs an object.
 *
 * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
 *   The config factory.
 */
public function __construct(ConfigFactoryInterface $config_factory) {
 $this->configFactory = $config_factory;
}

Add '@config.factory' argument to .services.yml file