Assuming my computer wouldn't explode, I would dig down and cover up all blocks above me. The mobs will despawn and kill themselves. The 10000 iron golems, snow golems and withers will also help. The skeletons who will attempt to shoot at snow golems and iron golems will likely accidentaly shoot other mobs and like that they will eventually kill eachother.
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what if u make a building out of tnt and blow it up?
You are probably wondering how you got your self into it. you go into the end killed the ender dragon you take the egg the egg hatches in the mine they duplacate an start to spawn more mobs by mob spawners