"You're naive. Magic is just power, like any tool. If people are fighting, giving them more power enables them to fight more. People do fight over resources, but many fights are over outcomes, ideals, the future of the world. Resources are just the things that get you there. If your power was only useful for helping free people and moving them to new planets where no-one would ever find them, that would be incredibly good. But I think your power can be used to many ends, because that is the nature of most power, and so everyone is going to fight over it."
"I want to be clear that the ability you're describing is unprecedented. I've never heard of anyone, even gods, claiming to have created whole planets. Sometimes catastrophes happen, and a lot of people die. If a Good god could evacuate them to a new planet, or even to another plane, they would. They can't even stop famines!"
"I've heard an Iomedaean say this is because the gods oppose each other, and if a Good god tried to help, an Evil one would stop them. This doesn't make sense to me, because the gods can't be that precisely balanced by each other, and a lot of big changes do happen that favor some of them over others. And some people say Evil gods cause the famines in the first place, when the Good gods are too weak to stop them."
"But the gods don't talk to me. Only the most powerful clerics say their gods talk to them, and most of them can't be trusted." Neither the gods nor the clerics.
Deep breath.
"If you send everyone that message, with no explanation or proof of your intent, only the desperate and the stupid would pick it." And half the Desnans, probably, and many many demons. "That may be much better than doing nothing. But the average slave, who is not about to die or to be tortured, would not choose an unknown fate backed by empty words, and many more would think it a trick, or a test of loyalty."
"And then the governments and churches will become aware of you, and so will the gods. I have no idea who could stop you from unexpectedly teleporting people. But once you do, everyone will be very motivated to find you and make you either their ally or their slave. And if you think you can take on everyone, you wouldn't start with freeing a few slaves, you'd start by freeing Hell, because they own the country of Cheliax, which has a lot of desperate slaves in it, and so they will be among your enemies."
"As to how they might fight you: the most powerful spells can locate anyone, anywhere. They can teleport anyone to your location, or teleport you somewhere else, even to another plane. At shorter range they can take over your mind and control everything you do, or read your thoughts or affect your behavior without your even noticing. They can predict the future. They can ask the gods for knowledge, and some of the gods are gods of knowlege and they know a lot."
"There are hundreds, maybe thousands of spells, and no-one knows them all. The most powerful wizards keep what they can do secret, because they're afraid of their rivals. The only things I can be sure a spell can't do are the things that no-one has ever done."
"And if a god intervenes directly, which they can, they can do literally anything. They're not limited to a selection of spells, they can create miracles that solve whatever problem their highest cleric is bothering them about. There must be some limits to what they can do, but they're certainly not public knowledge. The last time the gods fought each other on Golarion directly was a century ago, and it killed a god, opened the Worldwound, sunk a country into the sea, and killed half the population of some other countries. And two more countries became Lawful theocracies. So no-one is very eager to have the gods intervene again."
"So instead, I suggest you learn a lot more about the world, reach out in secret to a few trustworthy people or even gods, and prepare a much bigger surprise attack than setting free the slaves who'd pick a complete unknown over their present life."