Overall meaning : Therefore, admonish people, Muhammad, and remind them with the verses of the Qur’an, for I have sent you only to remind them. You are not appointed to be in control of them, compelling them to believe in Allah and obey Him.
As for those who turn away from the truth and disbelieve after having been reminded of Allah’s verses, Allah will inflict on them the greatest torment of the Fire in the hereafter.
To Us will they return after death, then it will be for Us to call them to account for their actions and repay them according to their deeds.