A 52-year-old man with known essential hypertension (on amlodipine 5 mg daily) presents with BP 156/96 mmHg. He reports recent onset of fatigue and mild ankle edema. Serum creatinine is 1.8 mg/dL (baseline 1.0 mg/dL 6 months ago), and urinalysis shows 2+ proteinuria. What is the most appropriate next step in management?

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