Assume that the future can change based on your actions, so any historical information that you bring along with you from the intervening 25 years may quickly drift out of the new realities history.
Edit: also assume that you can be given a healthy 21-year-old body if you want or take your previous self’s place.
Further, identification will be provided for you if you were not born at that time.
You have to prevent 9/11. Then you can still walk your grandma to the terminal when she flies to the Bahamas.
Prevent Gore losing
All you’d have to do is generate money with the information you brought back and then campaign for Gore in Florida like nobody’s business. None of this hanging chads bullshit.
That and preventing 9/11 would completely and utterly change the world most likely for the better.