إِلَامَ تَسْتَمِرُّ عَلَى غَيِّكَ
How long will you persist in your waywardness?
Ilāma is formed from ilā + mā interrogative, with the final alif of interrogative mā omitted. It means “until when?” Here the question functions as a rebuke for prolonged negligence.
Ghayy is a misguided course. The force of tastamirru is therefore persistence in a wrong pattern, not merely continuing an ordinary action.