If you were to be able to time travel from your birth to death what would you do?

Meh.. I guess I would go back when I was a child and stop all my mistakes and not because some of the simplest stuff but because my worst mistake was asking for a younger bro, since I was 11 or 10 I wished they weren't born and wished I could kill them (i still do) cuz I preferred being the most favourite and WANTS my love back...