A 68-year-old patient with CKD stage 3b (eGFR 32 mL/min/1.73m²), type 2 diabetes, and heart failure with reduced ejection fraction (HFrEF, LVEF 35%) presents for medication review. Current medications include metformin 1000 mg BID, lisinopril 10 mg daily, and furosemide 40 mg daily. Which treatment plan adjustment is MOST appropriate?

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