iPhone 7Plus won’t turn on

I woke up wanting to check my Twitter and the app wouldn’t open just returned to the home screen. So I turned my phone off and on again and ever since it’s been only showing the apple logo screen. I’ve tried restarting it, it sometimes flashes black, then the logo but just stays stuck on the logo. I think my iOS needed updating so it could be doing that. It’s been doing this for 2 hours HELP! 😫😂