A 52-year-old man with type 2 diabetes mellitus on metformin 1000 mg BD presents with a 3-month history of progressive polyuria, polydipsia, and weight loss. His current HbA1c is 9.2%. Physical examination reveals no signs of diabetic ketoacidosis. Fasting blood glucose is 186 mg/dL and postprandial glucose is 248 mg/dL. What is the most appropriate next step in management?

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