A 52-year-old man with type 2 diabetes mellitus (HbA1c 9.2%) presents with blurred vision for 2 weeks. Fundoscopy reveals multiple dot-blot hemorrhages, hard exudates in a circinate pattern around the macula, and microaneurysms in all four quadrants. Visual acuity is 6/9 in both eyes. Optical coherence tomography (OCT) shows central macular thickness of 285 µm with intraretinal cystoid spaces. What is the most appropriate next step in management?