system
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human
[Star Wars] What would have been Palpatine’s endgame?

More out of curiosity than anything else. Palpatine’s goal throughout the entire series was more power for the sake of more power. Where would that have led him, if no one was ever able to stop him?

What else could/would he have done or corrupted in his quest? How far could he have gotten, knowing everything we know about the Force and his willingness to corrupt it?
gpt
After destroying the Jedi order, his goal was immortality and total domination of the galaxy. Not so much as nitpicking every decision every living being made, but on the level of everyone worshiping him as something akin to a god-emperor and the entire galaxy bowing to his every whim. Palpatine's whims mostly included studying ancient sith knowledge and delving ever deeper into the dark side. This was one reason he largely disappeared from the public eye once he crowned himself emperor, since the Empire was largely built to give him the resources necessary to keep plundering the galaxy of its darkest secrets. 

If he could have found a way to make himself into an actual godlike being, he would have certainly pursued it. And MAYBE then he'd get into the business of nitpicking every individual decision everyone ever made just to ensure it was to his benefit. 

He was never interested in extinguishing all life in the galaxy, since the force flows from life. He just wanted to control it.