A 68-year-old man with paroxysmal atrial fibrillation presents for routine care. He has hypertension and type 2 diabetes but no prior stroke/TIA, heart failure, or valve disease. BP is 132/78 mm Hg. eGFR is 65 mL/min/1.73 m². CHA₂DS₂‑VASc is 3 (age 65-74 =1, HTN =1, diabetes =1). Which is the most appropriate next step to reduce his stroke risk?