If i was a god...

[Yuhaney]

I would:

Remove every possible disease.

Eliminate death.

Get people back from the dead who have died because of things they didn't cause themselves (holocaust, disease, murders, abortion, etc.)

I would remove humans who are only selfish, greedy and harmful to others and/or to the Earth, thieves, murderers, rapists, child molesters and all kinds of other useless junk.

Remove possession, so that everyone on this planet could eat, drink and live happily without constant fear.

Those came to my mind at first. But since I'm not God, I can't do anything.