Iphone not powering after it went off charge?

I had my iphone X gone off charge like six hours before connecting to a charger! It never powered on since then, i tried different ways like quickly pressing and releasing the volume button, quickly pressing and releasing the volume down button and holding the power button. I have tried a couple of times but it hasn’t shown any signal.. what could be the problem? Here is my serial no. G6****CLF. Advice needed


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