I can't do anythink... My phone is in hardbrick...
Try then connecting it to the charger for 2 hours or so.
Then connect it to your PC via USB, and monitor on the PC if it shows any signs of life as you do:
Then try holding the power button for a long time.
Then try the other power button + volume button combinations.
If nothing at all happens, connect it back to the charger overnight and try again next day.