A 63-year-old woman with long-standing hypertension and diabetes presents with progressive dyspnoea, orthopnoea and bilateral leg oedema. Echocardiogram shows EF 30% with global hypokinesis. She is euvolaemic after appropriate diuresis and on guideline-directed ARNI, beta blocker, MRA and SGLT2 inhibitor. Which additional intervention is recommended to improve outcomes in eligible patients according to Canadian heart failure guidelines?