A 58-year-old woman with COPD GOLD stage II (FEV₁ 55% predicted) on maintenance therapy (tiotropium + salbutamol PRN) presents with 2 exacerbations in the past 12 months. She denies current dyspnea or fever. Spirometry today: FEV₁ 52% predicted (baseline 55%). What is the most appropriate next step in management?

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