A 58-year-old woman with CKD stage 5 (eGFR 8 mL/min/1.73m²) on hemodialysis presents with fatigue and dyspnea on exertion. Hemoglobin is 7.2 g/dL, MCV 88 fL, reticulocyte count 0.8% (normal 0.5–2.5%), serum iron 45 mcg/dL, ferritin 280 ng/mL, TSAT 18%, and EPO level 85 mIU/mL (normal < 20). She has not received any ESA in the past 3 months due to supply issues. What is the most appropriate next step in management?