Redoing my life and retaining all the knowledge I've accumulated from my painful, yet enlightening journey called life would be like living with godmode enabled. I would be a fucking unstoppable demigod among all the NPCs. Believe me, I would be filthy rich and everything else that you could possibly think of.
Not only would I be able to looksmaxx really hard and get super tall, I would be able to predict economic trends and exploit it to get very rich. I would also be able to predict everything with a high accuracy.