Broken home button

Hey everyone

I broke my home button on my iPhone 7, then I tried to restart the phone but after I turned it off it just wouldn't turn on again.

Everytime I try to turn it on what happens is the following:

The screen shows the Apple logo on a Whit background, as usual

Then, after a few seconds the screen turns black , there's a flash on the screen and then it turns off.

After it turns off the whole thing starts all over again without me doing anything (apple logo->black screen->flash->turns off)

Does anyone have any advice for me on how to get the phone to work ?

Thank you all!!!

P.s- I later updated the iOS version via iTunes but it didn't help.