Hello buckmaster32,
Thank you for posting in the Apple Support Communities. I see you're unable to turn off Do Not Disturb on your iPhone.
Restarting was a great place to begin troubleshooting. If you've reset your settings as well, there are a few other things to consider.
Does this happen at certain times of the day, or is it constant?
Have you double-checked your Bedtime settings? There's a separate scheduled Do Not Disturb function there that I recommend double-checking: Use Bedtime to track your sleep on your iPhone.
I also recommend checking your software version to make sure you're running iOS 12.1.2 under Settings > General > About. Updating may help resolve unexpected behavior and, if needed, here's How to back up your iPhone, iPad, and iPod touch and Update your iPhone, iPad, or iPod touch.
I hope these steps help you.
Take care.