> there's really not much you can do apart from moving the whole damn planet out of the way.
You can put something in between, a giant sun shade
Can artificial clouds help? Geo hacking might be cheaper than building billions of acres of shade.
Or a giant solar array?
Chunks of other planets, we have always been pretty good at creating explosives previous generations couldn't even fathom so such destructive disposition may get to be a positive thing for once.