Is it permissible to listen to the legitimate ruqyah from YouTube alone, and what is the ruling on that? And is treatment with the Qur’an limited to a specific ruqyah for each person?

It is best for one afflicted by magic, jinn possession, or the evil eye to treat themselves by resorting to Allah Almighty, relying on Him, reciting the Holy Quran, performing legal ruqyah (definition), and increasing remembrance (dhikr) and supplication (du'a). There is no specific ruqyah for every person, and there is no harm in listening to the verses of legal ruqyah by any permissible means, even if it is by itself.