The retired life of a Archmage

The strongest Archmage wasn't born in a noble house hi was of low status and an orphan.But he had a secret he remembered his past  life as university student as a loner who was fat and was bullied by everyone until he decided to jump and end his life. But after his death he heard  a silent voice saying (Kid I have been watching over you for a long time a know everything about you as someone who has been bullied for being fat and a loner you who didn't live your life I will give you a second chance to live and as a gift you will receive the blessings of mana and spirits so you can live your life to the fullest). After hearing that voice he said: Why me I'm nothing more than a fat and ugly loner someone with nothing? The voice laughed and said to me you are nothing more than a poor soul so I'm just choosing you as I have taken a liking to you so I hope you don't disappoint me. The young man didn't say a thing as this was the first time that someone has said those words to him so he just stayed there crying. And the voice said -Now that we are done let's get going. Now you will be born as a young man named Rain Einstad but you will be a orphan so you must do your best to live and become someone we'll known. After the voice finished speaking he was immediately sent to another world where magic and monsters existed in the body of a three year old kid with silver hair and blue eyes.After he woke up in that body he said Now that I have been given a second chance I won't let anyone bullies or trample on me I will become the strongest.