A 52-year-old man with ischemic cardiomyopathy (LVEF 28%) and NYHA Class III heart failure is referred for cardiopulmonary exercise testing (CPET) to guide management. He is on optimal medical therapy including a beta-blocker. During the test, his peak oxygen uptake is found to be at the threshold marked **B** in the diagram. Which of the following is the most appropriate next step in his management?
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