power button is broken and how can I resart my phone then.

since my phone power button is broken i always have to charge my phone before it shuts off,due to the power button is broken and then i wont be able to turn it on.Butyesterday morning i saw MY PHONE SHUT OFF because i forgot to charge it the day before.so i rlly need help how can i turn on/restart my phone without using the power button cuz obiously its broken plz help quick.