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.
Do the whole Back to the Future thing and take back a list of lottery winnings, stock picks, etc. Just keep slyly moving things around at the proper times and you’d have no trouble becoming the next Bezos.