Why its not have master reset as like press and hold the power button

The safe mode generally happens when the buttons for power or volume up or down are stuck or damaged. So the phone goes into safe mode cause it gets a signal that the buttons are being pressed.

You can try firmly tapping the side of the device were the buttons are located to see if it's a mechanical failure that you can loosen the button back to the unpressed position but often times it requires replacement of the switch under the buttons to fix.