I think we could probably get away with killing 3-5 billion people. 1.5b of that would be continental india which does fuck all.
Then consider how many jobs are just outright useless or even destructive? Do we really need 6 million factories who's only purpose is to add corn syrup and preservatives to food? Not only would we free up labor, people would be healthier and it would make up for the lack of people producing food. Not to mention all the people that wouldn't need super markets to begin with. We could also stop using 271k square miles for growing infinite corn and soy that poisons the water or turns it into hrt.
China can probably go, too. They're like slop factories but for shitty consumer goods. We'll have too much work to do to be buying temu garbage to throw away in a week.
I don't think there'd be any labor shortages or crisis at all. Some supply line issues initially, but we've got all the shelf-stable slop across the planet to hold everyone over for a while.
Hell, we could probably do 6b. I don't think it would be much trouble at all.