A 52-year-old male construction worker from Rajasthan presents with a 3-month history of painful, swollen gums with bleeding, poor wound healing, and follicular hyperkeratosis on his lower extremities. He reports a diet of rice, dal, and occasional vegetables but no fresh fruits for the past 8 months due to financial constraints. Hemoglobin is 10.8 g/dL (normocytic). What is the most appropriate next step in management?