Disagree heavily, but okay. And if you were so powerful, you could localize the aftereffects of such a miracle so that the catastrophe you describe wouldn't happen.That's a really bad idea - it would destroy humanity and maybe all life on Earth. Try not to be so evil.
Summon one of your previous lives then. Resurrect somebody on camera. Bring someone nearly dying of old age to the prime of their youth. Create a superstructure taller than any building in history made entirely out of light.