Here's what would happen.
Little pamphlets would appear everywhere. Billions of them. They would tell you people the basics, stuff everyone already knows. Play nice, stop messing up the planet. Humans don't need more rules, they just need motivation to follow them. I'd let it be known that causing harm will have equal consequences.
Then I would provide some practical info, like a recipe for an all purpose antiviral, and an earthquake predictor.
Here's what would make this work. Each pamphlet would be identical, yet be understood by everyone regardless of language. Everyone would get exactly the same message, whether a Chinese peasant or Oxford professor or Mexican drug dealer. That's the miraculous part that will let everyone know it's from Me.
Tom