Am I sinful for having afflicted my nephew with the evil eye after he passed away, and how do I atone for that?

The evil eye is real and can be warded off with legitimate Islamic incantations (ruqya) and protective supplications, such as the two surahs of refuge (Al-Mu'awwidhatayn), and saying: "Bismillah, I perform ruqya upon you from everything that harms you, from the evil of every soul or envious eye, may Allah cure you." Or by the person who cast the evil eye washing themselves and pouring the water over the affected person, or by the person who cast the evil eye invoking blessings by saying: "Masha'Allah, La Quwwata illa Billah (What Allah wills, there is no power except with Allah)." Indeed, the Prophet, peace and blessings be upon him, said: "If one of you sees something in himself or his brother that he admires, let him invoke blessings, for the evil eye is real." If you have afflicted someone with the evil eye, you must repent. Scholars differ regarding the ruling on someone who intentionally cast an evil eye on a person, leading to their death. Some said that they are not liable, and there is no expiation or blood money upon them, because the evil eye generally does not kill. Others said that they are liable and must face retribution (qisas) or pay blood money (diyah). It has been narrated in a hadith: "The evil eye can put a man in the grave and a camel in the cooking pot," and "Most of those who die from my Ummah, after Allah's decree and destiny, die from the evil eye."