A 68-year-old man presents to the urology clinic with a 2-year history of progressive lower urinary tract symptoms (LUTS). He reports nocturia 4–5 times per night, weak urinary stream, hesitancy, and incomplete emptying. Digital rectal examination reveals a smooth, firm, symmetrically enlarged prostate without nodules. Post-void residual (PVR) is 120 mL. Serum PSA is 2.8 ng/mL. Uroflowmetry shows peak flow of 8 mL/s (normal >15 mL/s). He has tried lifestyle modifications without improvement. What is the most appropriate next step in management?