Hancock_Sama
I would like to give some advice to the author friend, to explain why the mc is practically a child in personality, even having awakened his memories, first is that while he was training and living with death and ydrasyl, he was in a body of soul and not meat, so he was able to overcome his death and all the feelings of loss and the like, that would explain him having memory but not feelings of longing and things like that, second is that in the current body, after awakening the memories , he would still be childish because all the emotional and maturity charge of the past life would still be awakening little by little, like someone who wakes up early and spends the morning slow and sleepy, that's why he's still so childish, of course beyond the influence of propriop child's physical body, all this would give logical and rational explanations to the current situation of the mc, I recommend the maturation and revival of the personality he had in his first life, through the passage of time or hope. Emotional stimuli, something like what you've done to always have the will to get stronger even before you have your memories, this would all fit into the current reality shown in the story and would even explain certain childish or clueless behavior that is something if would expect from a child and not from someone who has already lived a full life cycle. Hope the suggestions help and author friend blessings.