I'd tackle the things that I think have the greatest impact on the survival of humanity: * preventing bad-actor AGIs that came after my AGI, * slowing climate

I'd tackle the things that I think have the greatest impact on the survival of humanity: * preventing bad-actor AGIs that came after my AGI, * slowing climate change to 3% rise by 2100 and reversing if possible (I don't think it is before it becomes critical at our current level of technology), * slowing pandemics/improving health to eliminate distractions from the other problems, * enabling space colonization for the masses with at least the survival rate of the early U.S. colonies in the 1600s (moon first, then lagrange points, then Mars, then Ceres, then interstellar - each serving as a launching point for the next).