Why can't Wei Wuxian find a soul?

Because Wei Wuxian can be reborn, of course, it means that his soul has not disappeared, but if it has not disappeared, how can it not be asked? Moreover, all kinds of signs can prove that Wei Wuxian was sober during 13 years. First of all, when Wei Wuxian first appeared, Mo Yuxuan was being bullied by Mo Ziyuan. At that time, Wei Wuxian thought that he had not heard the voice of the living for thirteen years. During these thirteen years, he has never seen other "people".