You can only warn one who follows the message and fears the (36:11)

﴿إِنَّمَا تُنذِرُ مَنِ اتَّبَعَ الذِّكْرَ وَخَشِيَ الرَّحْمَٰنَ بِالْغَيْبِ ۖ فَبَشِّرْهُ بِمَغْفِرَةٍ وَأَجْرٍ كَرِيمٍ﴾
[ يس: 11]

36:11 You can only warn one who follows the message and fears the Most Merciful unseen. So give him good tidings of forgiveness and noble reward.

The person who really benefits from your warning is the one who accepts this Qur’ān and follows what is contained in it, and who fears His Lord in solitude where nobody else sees him.
So tell those who have these attributes the pleasing news of Allah’s wiping out their sins and HForgiving them and of a great reward awaiting them in the Hereafter, which is entry into Paradise.

You can only warn him who follows the Reminder (the Quran), and fears the Most Beneficent (Allah) unseen. Bear you to such one the glad tidings of forgiveness, and a generous reward (i.e. Paradise).

phonetic Transliteration

Innama tunthiru mani ittabaAAa alththikra wakhashiya alrrahmana bialghaybi fabashshirhu bimaghfiratin waajrin kareemin

Abdullah Yusuf Ali - Translation

Thou canst but admonish such a one as follows the Message and fears the (Lord) Most Gracious, unseen: give such a one, therefore, good tidings, of Forgiveness and a Reward most generous.

Safi-ur-Rahman al-Mubarakpuri

You can only warn him who follows the Reminder, and fears the Most Gracious unseen. Bear you to such one the glad tidings of forgiveness, and a generous reward.

Page 440 English transliteration