I would just google a load of scientific theories, write them out word for word with an inkwell to they look authentic and then go back in time and start talking about them to to scientific community.
I'd go down as the greatest inventor in history, and because of this I may be able to impart a better way of life than the selfish, self-serving version of "capitalism" we have now to try and combat poverty, disease and starvation around the world, which would allow the human race to advance at a faster rate so we can explore the universe earlier to that my pals can go for a night out on an asteroid somewhere 2,000,000 light years away and chat up some sweet alien babes in 2021.
You'd probably be killed by the dogmatists for going against the prevailing (dogmatic) views of the time.
As an example imagine that the green/politically correct/woke brigade of today have got everything totally wrong and through their "progressive" vision end up almost destroying humanity, so some guy comes back from the 25th century to tell them today that everything they're promoting is going to lead a miserable future for humanity, how do you think he will received?
1> Dismissed as a hateful individual.
2> Censored from social media.
3> Cancelled for hate speech.
4> Smeared as far right.
5> Ignored.
The scientific facts don't matter they won't listen to them.