Your numbering is my numbered priority list.

Zombies is simple: Learn quickly, establish local order, pre-emptively shoot anyone who things cloth masks stop the zombie virus, and just move on with life having one additional human-hostile predator on earth. Fast or slow, they're slower than brown bears, and bears can take several bullets to the head, we deal with those just fine.

Nuclear is an oddity, because "armageddon" can mean multiple things. How long will the nuclear winter be? Every capital, or every major city, or random bombardment? But a decent chance exists to pick yourself back up.

Aliens either want humans gone, or don't. No agency on my part, it's a weighted coin flip. Their morality will seem foreign to us even if they let us live, but...

Not as foreign as #4, which delights in reality-denial and science-denial. Remember, local left-wing tinpots have done such things as declared that saying "2+2=4" is racist and/or sexist, and should be punishable by law. Remove all signs of the past that disagree with the present. Change the present daily. If they had the power to make those laws... All progress, gone. All proof of our existence, gone.