Going to sound strange but I think we should be praying for mercy for our enemies...
✝️ Scripture 🕊️
God will win and His might is beyond what we can imagine. Those that are the enemy of God will suffer enormous loss. Pray for God to have mercy on even those that are against Him.
Remember we were all against Him before He came looking for us and found us.
And what is the unpardonable sin? To blaspheme the HS? That's just the refusal to repent. Careful how you mete out vengeance because that is how it will be meted back to you.
If blasphemy against the HS is to spill innocent then the Crucifixion is the unpardonable and so no forgiveness would be possible.
Where is this in scripture? Where does it say that you have to declare yourself God while killing someone to commit an unpardonable sin?