Power button not working

So the power button on my phone Nokia 6 ta-1021 decided to stop working this morning. A few months ago my navigation button i think that's what u called it? Or is it home button? Anyway the button that u use to navigate is broken. So I'm downloading assistive touch apps, and thanks to that apps i can turn off and lock my phone without using the power button. But the problem is that i can't turn it back on! Is there a way to solve this? Help please.....