Ovulation Induction in Clomiphene-Resistant PCOS

A 29-year-old woman with a history of recurrent ovulation induction failures presents with primary infertility for 3 years. She has regular menstrual cycles (28–30 days), normal BMI (22 kg/m²), normal FSH (6 mIU/mL), normal prolactin (18 ng/mL), and normal thyroid function. Transvaginal ultrasound shows bilateral polycystic ovaries with 12–15 follicles per ovary. She has undergone three cycles of clomiphene citrate (50–100 mg daily for 5 days) without ovulation. Which is the most appropriate next step in management?