A 28-year-old man from rural Maharashtra presents with jaundice, dark urine, and abdominal pain for 10 days. He has no prior history of liver disease. Serum bilirubin is 8.2 mg/dL (direct 5.1 mg/dL), ALT 1840 IU/L, AST 1620 IU/L, ALP 180 IU/L. Anti-HAV IgM is positive; anti-HBc, anti-HCV, and anti-HDV are all negative. INR is 1.1, albumin 3.8 g/dL, and he is alert and oriented. What is the most appropriate next step in management?