Hypertension & Its Management — Practice

A 50-year-old man presents with a history of recurrent retrosternal chest pain with each episode lasting for 3-5 min and subsiding with sublingual nitrate. ECG shoes left ventricular hypertrophy and flat T-wave. He is a known case of hypertension, diabetes mellitus, hypercholesterolemia currently on aspirin, atenolol, metformin, and lovastatin. What is the next best step in management?