34-year-old women was seen for easily bruising. She is previously healthy and takes no medications. On examination she had petechiae over her arms & legs. No organomegaly. Her CBC showed WBC of 6000 (5000-10,000), Hg 12g/dl (12-14) & platelets count of 18000 (150,000-350,000). Peripheral smear showed decreased number of platelets. What is the most appropriate management for this patient?