Last-Ditch

My fellow last survivors—our remaining scientists and generals have ideated some last-ditch methods to defeat this thing:

1. Trick it into thinking we have a mate for it. Challenging, since the decoy would have to be the size of a mountain.
2. Cut off all its tentacles. However, as we know, each stub regrows 5 more.
3. Nuke it. But last time, the energy just made it stronger.
4. Unleash our fury at it, literally. Our exobiologists believe hatred makes it feel genuine despair. In that sense, it’s kinda human.
5. Abandon Earth. Honestly, this is sounding better and better.