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.
Don’t go all in to try and be the majority in a ton of things, and good luck PROVING insider information.
Besides if you make enough money, you can just make investigations go away as long as you aren’t too flashy about it. Or have a convenient distraction story waiting elsewhere to divert attention away from yourself.