A 58-year-old man with a 20-year history of type 2 diabetes mellitus and hypertension presents to the cardiology clinic for evaluation of chest discomfort on exertion. His lipid profile shows total cholesterol 285 mg/dL, LDL cholesterol 180 mg/dL, HDL cholesterol 32 mg/dL, and triglycerides 320 mg/dL. He is currently on metformin and amlodipine. Resting ECG shows nonspecific ST-T changes. What is the most appropriate next step in management?