What would you do to make yourself known and to improve things in the world?
I'd find a random old guy and tell him everything I want done. Then I'd have him write a book about it and hope it all works out from there. . . Wait no that'd be stupid.
I'd write magic text in the sky that says: "Under new management" for a week (But it goes away temporarily during sunrise and sunset, I don't wanna mess that up.) It would of course be magic text which is readable by every language from everywhere on earth. It'd be mirrored for people in the space station cause that would be funny.
(I split the miracles up into days because it build anticipation and makes people excited.)
Day 1: I cure everyones ailments. Stop all natural disasters and change all diseases so they no longer effect humans.
Day 2: I make children invincible. In most video games when you attack a monster, it kills them, when you attack a friendly person or a child, it goes right through them. That's how real life should be!
Day 3: I create a spell for summoning bread and fresh water. You just gotta draw some simple design on a container from dirt, ink, poop blood or whatever and a loaf of very nutritious bread appears inside the container. Tada, hunger is now solved worldwide, but you still gotta work if you want yummy food.
Day 4: Addiction is no longer possible. Human brains stop thinking they need substances they really don't need. Drugs still work, you just don't get addicted.
Day 5: I make a set of laws and rules, very simple ones. Everyone who follows these rules has the ability to teleport out of this dimension into a paradise-like dimension and associate with other people who follow my rules. They can of course teleport back and forth from this dimension whenever they want.
Day 6: People who follow my rules gradually grow younger. When you stop obeying my rules, you gradually grow older 3 times as fast as you grew young. (That way you have to be good at LEAST 3/4 of the time) You can't die if you're following my rules. All of my rules are written on the inside of your freeking eyelids from birth which you can see just by thinking about them. This way nobody can change them without my permission.
With those changes in place, it's now pretty much impossible for innocent people to be harmed.
There's a little bit of micromanaging I'd have to do for a while. For example I'd probably give some kind of perks to all the doctors, nurses, firemen and other people who were awesome but depended on suffering to live and are now out of jobs.
Sound a bit rediculous? Yeah well, I'm omnipotent, I can do rediculous things. Frankly if god existed these are the kinds of changes I'd imagine he'd make make. And I'm pretty sure none of this violates free-will.