A 38-year-old woman from rural Maharashtra presents with a 3-month history of progressive dyspnea, dry cough, and constitutional symptoms. Chest X-ray shows bilateral hilar lymphadenopathy with upper lobe infiltrates. Serum ACE level is elevated at 85 U/L (normal <40). Transbronchial lung biopsy reveals non-caseating granulomas. What is the most appropriate next step in management?

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