Time Travel

Humans have a tendency to make mistakes. Some have a wish to go back in time and fix all the mistakes they have done consciously or unconsciously. My character is now on the death bed and willing to change his life blunders. He must have some major reasons to do so, it could be his not so accurate choices  in multiple phases of his life. He had a constant urge to go back in time and make things better. It seems he had found a way.