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.
stock data
Bitcoin has outperformed stocks by about 100,000-fold. All you need is a fiver to invest at the beginning.
Note that that return is only for the early investors. If you are incredibly lucky and we have a very flush couple of years you might triple an investment in by 2030 now. But you are also very likely to just lose it All