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The cause of being a good conductor brings to us a better understanding about what makes a good insulator. So what is the reason of being a good conductor? The answer is 'free electrons' of the material. For more information - https://www.expii.com/t/what-makes-a-good-conductor-1635?type=explanation&id=6842
So, the fact which is responsible to make a good conductor is completely opposite at the time of good insulator. The inferiority of free electrons inside any object makes a good insulator.