A 52-year-old man with type 2 diabetes mellitus (HbA1c 9.2%) and hypertension presents with microscopic hematuria and proteinuria (0.8 g/24 h). Serum creatinine is 1.4 mg/dL (eGFR 58 mL/min/1.73 m²). Renal ultrasound shows normal-sized kidneys with increased echogenicity. He is currently on metformin 1500 mg daily and amlodipine 5 mg daily. What is the most appropriate next step in management?

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