A 28-year-old woman from rural Maharashtra presents with fatigue, dyspnea on exertion, and menorrhagia for 8 months. She works as a farm laborer and reports a predominantly vegetarian diet with rare meat consumption. On examination: pallor, tachycardia (HR 104/min), and glossitis. Laboratory findings: Hb 7.2 g/dL, MCV 62 fL, serum ferritin 8 ng/mL, serum iron 28 µg/dL (normal 60–170), TIBC 420 µg/dL (normal 250–425), transferrin saturation 6.7%. Peripheral blood smear shows microcytic hypochromic RBCs with target cells. What is the most appropriate next step in management?