I would start by coming down and proving my existence. I would then hope to reinstate belief by fixing all of the many errors of the world. All pedophiles would be eliminated. All of the bad would be wiped away. I would insert something into the human strain to prevent children from being born just to die. I would wipe away the bad from humans to prove to them people can all be good without "being the same". I would then teach people that their belief is not what helps them, but more importantly how they treat other and the world is what helps them. That would certainly be a full day. It seems if a God were real these would be things done already or done at creation.