You can't start a story being a "changed man" already. The story should change the character as they experience it.
Ebeneezer Scrooge didn't start the story by wanting to be good. He learned to be good while experiencing the story.
Give us more on the main character. It needs an adjective for him and a better goal than "rebuild himself".
Honestly, as I read this I realise that your logline almost sounds like the END of a story. After the main character has died and paid the ultimate price, he gets a second chance and learns from his mistakes.