A 48-year-old man with type 2 diabetes managed with lifestyle measures attends for review. His repeat fasting plasma glucose is 7.4 mmol/L and HbA1c is 7.1% (54 mmol/mol). He has a BMI of 32 kg/m², blood pressure 138/84 mmHg and eGFR 80 mL/min/1.73 m². According to current Australian guidance, what is the most appropriate next step in glycaemic management?