A 52-year-old man with a history of chronic alcohol use presents with pancytopenia. Hemoglobin is 8.5 g/dL (MCV 105 fL), WBC 3200/μL, and platelets 80,000/μL. Peripheral blood smear shows macrocytic RBCs, hypersegmented neutrophils, and anisocytosis. Serum creatinine is 1.2 mg/dL. What is the most appropriate next step in management?

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