A 65-year-old man with long-standing hypertension and type 2 diabetes is found to have an eGFR of 45 mL/min/1.73 m² and an albumin-to-creatinine ratio of 50 mg/mmol on two occasions. Blood pressure is 148/88 mmHg on a thiazide diuretic alone. According to Canadian CKD and hypertension guidance, which of the following is the most appropriate change in management?