A 58-year-old woman with seropositive rheumatoid arthritis on weekly methotrexate 17.5 mg for 6 months presents with subacute non-productive cough, fever, and progressive dyspnea on exertion over 3 weeks. SpO₂ is 90% on room air. HRCT shows bilateral ground-glass opacities and patchy consolidation. Spirometry reveals the pattern marked **A** in the diagram. Which of the following is the most appropriate IMMEDIATE management step?
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