I was 11 in 2007. There would be little I could do. What exactly can an 11 year old do?
Unless you are talking about transporting myself and reliving those ten years. I would try to work so I can invest in things like Netflix and Apple. Then I will buy like 20 copies of Xenoblade and sell them when they were $100 each. You know stuff like that. If you know the future you really can't lose in financial investments.