A 48-year-old woman with high myopia (–12 D) presents with sudden vision loss and a shadow in the inferior visual field for 3 days. Fundoscopy shows an inferior nasal retinal detachment extending from the equator to the posterior pole, with the macula already detached. There is no visible retinal break. B-scan ultrasonography confirms total retinal detachment with no vitreous hemorrhage. What is the most appropriate next step in management?