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.
I don’t know about stable diffusion but I know deep fakes would be handy. Being able to release videos to the public while retaining my privacy would be invaluable.
And if the CIA or the KGB decided to assassinate my alter ego they would have a hell of a time even finding the fucker and if they did find somebody that looked just like them and executed them that wouldn’t have killed me.