A 62-year-old woman had an ST-elevation myocardial infarction (STEMI) 3 months ago and underwent primary PCI. She has been adherent to high-dose atorvastatin 80 mg daily. Her current LDL-C is 2.1 mmol/L (baseline 3.9 mmol/L). She has no adverse effects. According to CCS dyslipidaemia guidelines, what is the most appropriate next step?