How to make the vibration stronger/more intense on an iPhone 5s?

How to make the vibration stronger/more intense on an iPhone 5s? - 1

Added (1). I'm not talking about creating a custom vibration pattern. I literally mean strength/intensity.
Please don't waste my time with stupidities. And if you don't know the answer, don't write anything. I'm not in the mood to see answers like "I don't know" or "not sure". So please don't waste my time.

It can't get any stronger than Apple made it.

I'm sure they have some upgrade part from china that you can have someone put in

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