65-year-old male patient presented to the emergency department complaining of shortness of breath associated with cough and small amount of clear sputum. Their symptoms have started 5 days ago since he was in a family gathering. Coronavirus PCR swab was conducted and came positive. Patient was admitted as a case of COVID- 19 pneumonitis. His oxygen saturation was 82% on room air, improved to 96% on 5L oxygen supply. Chest x-ray revealed bilateral airspace infiltrations What is the best next step to manage this patient?