A 28-year-old woman with a history of excessive alcohol consumption presents with recurrent episodes of fasting hypoglycemia (glucose 35–45 mg/dL) occurring 12–16 hours after her last meal. She is alert and oriented. Laboratory workup shows: serum lactate 8 mmol/L (normal < 2), alanine 0.8 mmol/L (normal 0.3–0.5), cortisol 18 μg/dL (normal 5–25 at 8 AM), and insulin 1.5 mIU/L. Liver function tests reveal mild elevation of transaminases and albumin 3.2 g/dL. What is the most appropriate next step in management?