Is it really your responsibility to go around inspecting teenage boys’ rooms to make sure they’re not on their phones?
Is it also your responsibility to make sure that someone doesn’t sleeps face down?
What kind of a rebbe are you? If I dealt with someone like you, I’d be turned off, also.
Teens need autonomy. They don’t need you to nitpick. You need to be gentle and kind-hearted. You catch more flies with honey than vinegar. You seem to lack the ability to teach and impart Jewish values and spirituality in any significant manner.
You’d be best leaving kiruv to the professionals.