A 52-year-old man with a 10-year history of type 2 diabetes mellitus presents to the outpatient clinic for cardiovascular risk assessment. His fasting lipid profile shows: total cholesterol 240 mg/dL, LDL-C 160 mg/dL, HDL-C 35 mg/dL, and triglycerides 280 mg/dL. He is currently on metformin and lisinopril. Physical examination reveals no xanthomas or corneal arcus. What is the most appropriate next step in management?