A 48-year-old woman from Delhi presents with a 6-month history of symmetrical polyarthritis affecting the PIP and MCP joints of both hands, morning stiffness lasting 2 hours, and constitutional symptoms. Laboratory investigations show RF 120 IU/mL (positive), anti-CCP 45 U/mL (positive), ESR 68 mm/h, and CRP 12 mg/dL. Plain radiographs of hands show no erosions. What is the most appropriate next step in management?