If someone is lost which Dua should be recited for his welfare and comeback?

بسم الله الرحمن الرحيم

(Fatwa: 482/428/H=05/1440)

After each salah and at the time of going to bed, read انا لله وانا اليه راجعون eleven times with durood 11-11 times before and after, and keep supplicating for wellbeing and recovery.

Allah knows Best!

Darul Ifta,
Darul Uloom Deoband