Turn OnePlus 3 on with broken power and volume buttons As title suggests, I'm looking for a way to turn my OnePlus 3 on but I have the following issues:

Volume buttons do not work
Power button does not work
USB debugging is not enabled
Phone is currently off...

Any ideas?
There appears to be no obvious workaround to power on your device, if neither your power button or volume button work.
You might be able to revive your buttons with some isopropyl alcohol and intensive button pressing. On the old Nintendo DS, you were also able to briefly revive buttons by breathing/blowing into the buttons and repeated button presses.
Another more advanced possibility, if you have nothing too lose, is to open up the device and see if you can bridge the contacts the button is supposed to activate. You might also find replacement parts on the internet.