It is not true that steroids cannot be used for more than 6 days. We use it in certain situations for months together. So it can be used.
That being said, it is important to use steroid drops judiciously. It has lots of side effects as well. So please consult your eye doctor before restarting it and learn the right course of treatment.
Next Steps
Discuss with your doctor if a low potency steroid drop is a good option in your case for some time.