A 60-year-old man with type 2 diabetes has an eGFR of 60 mL/min/1.73 m² and a urinary albumin-creatinine ratio of 8 mg/mmol on two occasions 3 months apart. Blood pressure is 136/80 mmHg on no medication. What is the most appropriate next step to reduce his risk of diabetic kidney disease progression and cardiovascular events?