A 38-year-old woman with a 5-year history of episodic dyspnea and cough presents for spirometry. Results show FEV₁/FVC ratio of 0.72 (pre-bronchodilator), FEV₁ 82% predicted, and FVC 85% predicted. Post-bronchodilator FEV₁ increases to 91% predicted with FEV₁/FVC ratio of 0.78. She reports symptoms worse in the morning and after exposure to dust. What is the most appropriate next step in management?