A 67-year-old woman with heart failure with reduced ejection fraction (HFrEF) has a potassium level of 5.6 mEq/L while on a mineralocorticoid receptor antagonist (MRA). Her estimated glomerular filtration rate (eGFR) is 55 mL/min/1.73m². What is the best management strategy to maintain guideline-directed medical therapy (GDMT)?