Meteor, not likely anymore but it’s easily the only real killer for us now.

There’s nothing in our neighborhood that can fry us.

In reality there’s only two, stray objects we can see large enough to turn the entire crust into lava.

Yellowstone cauldron? Not big enough.

Nukes? Not enough of them.

Small-medium asteroids. Same as nukes.

Viruses? Not good enough to wipe out everyone.

It’s literally stray black holes, an asteroid we haven’t spotted large enough to wipe us all out. Or alien attacks ala dark forest from LSV attacks.