Obvsly, that Chi Chi Widow would go to Kami ASAP, tell him roughly what's going to happen over the next decade, ask for permission to go to Otherworld and train with King Kai and learn the Kaio-Ken so I can remain competitive once things get to that point.FInd the dragon balls during the time periods when nobody is using them, wish to remain at an eternal late twenties in terms of age. Learn to grow Senzu beans from Korin/Karin. Become a bean farmer on the side and keep in the shadows until the Saiyans show up. Then, uh, IDK, show up around the time Goku arrives back and then go along into space and beat up Freeza.
And, IDK, kill Dr Gero before Z starts.
Admittedly this does mean Goku probably dies from the heart virus ITTL. As this would basically be the original timeline Trunks came from. Unless I make a wish that Goku and his allies and close kin would be immune to all diseases and that wish is not beyond Shenron's power.
I'm probably ignoring Super for the purposes of this what if as well.
Mostly because it becomes "all your actions are utterly pointless because Zen-Oh erases half the multiverse in a fit of pique"
And the Omni-King was a shit idea.
Maybe I just have dumb ideas. IDK.
Oh, and I get a nicer gi. Maybe in blue and white colors. Or black and blue. Or something else.
Oh, and I teach the other Z-Fighters the Kaio-Ken so they won't get left behind so badly.
By the Saiyans.
Like, imagine Tenshinhan Kikoho + Kaio-Ken.
He'd be a beast.
Or Piccolo with the Kaio-Ken.
He was already Super Saiyan level post Kami fusion.
And able to go toe to toe with 17.
Even with a basic Kaio-Ken he'd probably have been able to CREAM 17.
Let alone the higher multipliers like x3 through x10 or x20.
Also maybe teach Mr. Satan stuff before he acquires his distrust of ki users.
Also, I revel in the fact that for quite a long time I'm probably the strongest person in the universe.
A human woman.