Let's face it, GT was a complete failure of a series, though I'm curious, what would you do to make it better. Now there are many things to fix in this show, so let's narrow it down to the top five things. My top 5 are:
1: The origin of the Black Star Dragon Balls are changed.
2: Goku dosen't become a kid.
3: The series is DBZ-esque from the beginning, unlike in GT where it took forever for the damn action to start.
4: Super 17 is the only villain of his arc, (might require some tweaks to his origin) this way the plot isn't such a fusion reborn rip off.
5: The shadow Dragon's orgin is changed.
So that's my top 5 what's youre's?