Iphone XSMAX won't turn on

hey!

I woke up this morning to a black screen and no activity! I've done all the tricks and looked up online how I could fix, nothing has helped! I've down the volume up and volume down them hold of the lock button for 30 seconds (and longer) and nothing.

I've tried plugging into iTunes (iTunes is at its latest update) and it hasn't come up at all so can't do the hard reset that way.

Is there anything else I can do?? My phone is in perfect condition I haven't dropped it its always worked fine just suddenly now won't turn on! it was also on charge all night!

HELP