A 34-year-old woman from Delhi presents with recurrent episodes of muscle weakness, myalgia, and dark urine after fasting or strenuous exercise. Serum creatine kinase is markedly elevated at 8000 IU/L. Genetic testing reveals a mutation in the SUCLA2 gene encoding ADP-forming succinyl-CoA synthetase (also called succinate thiokinase), a key enzyme of the TCA cycle. She is counselled about dietary and activity modifications. What is the most appropriate next step in management?