A 58-year-old man with a 15-year history of alcohol use disorder presents to the emergency department with hematemesis and melena. On examination, he is tachycardic (HR 110/min), hypotensive (BP 88/54 mmHg), and has clinical signs of cirrhosis including jaundice, spider angiomata, and ascites. Upper endoscopy reveals large esophageal varices with active bleeding. After initial resuscitation and blood transfusion, variceal bleeding is controlled endoscopically with band ligation. Which of the following is the most appropriate next step in management to prevent rebleeding?