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.
Forgot to mention in the edit, so adding as a new comment:
I’ll bring back my story ideas and complete them and publish them as books, it’ll let me pretend that I have an active imagination as a writer and that I just got lucky with the lottery and used it to put money in tech that fascinated me and just was good at imagining tech.
I’ll do a fast forward course of comp-sci to present RISC-V based on that and use common terminology to explain it as much as possible.