A 32-year-old primigravida at 39 weeks gestation presents to the labour ward with spontaneous rupture of membranes. On examination, the cervix is 2 cm dilated, 80% effaced, and the fetal head is at −2 station. Fetal heart rate is 140 bpm with normal variability. After 12 hours of expectant management, there is no progress in cervical dilation. What is the most appropriate next step in management?