You can’t grow in faith (or character or friendships) without learning to be humble. To forgive. To listen without agenda. To allow for the possibility you may be in the wrong.
Ask for help. God will give it.
Stuff will happen and you’ll think “I can’t get through this. I can’t go on.” In the moment it really feels that way. But ...You will survive. You’ll find a way. Never give up on yourself. I never will.
Being accountable means saying that I was responsible for making sure this did not happen - but it did happen. I accept the blame and an prepared to incur the consequences. I will work earnestly to earn back your trust and confidence. The opposite of accountability is to make excuses or blame someone else for your mistake.
“When it comes to consequences, don’t speak what you won’t serve.” Meaning don’t threaten any punishment you’re not willing to enforce. This is helpful in terms of teaching the child a lesson and also an important lesson in not shooting yourself in the foot. (I took away your tv one day you were home on a snow day. Bad idea. That punishment was against my own interest! I got no work done.
Check out fencing. Local fencing club has classes for kids and adults all ages. They also do birthday parties, so that might be something different that would be fun for him and his friends.
When the child is feeling upset or out of control, that is not the time to teach a lesson. Share your calm, be a safe place for them. When they’re feeling better, THEN teach the lesson.
When you have no idea what you’re doing, just be kind. Be brave. Think critically and make the best decisions you can in the moment. If possible, find resources to learn what you need to know. Ask for help if help is available. Do your best and don’t sweat it.