A young street level dealer must navigate the mine field of gang culture to get out before the gang implodes in a bloody internal war.

I think this concept is pretty good - it seems like a unique take on the gang story to have someone try to navigate gang politics to get out without giving the other members cause for offense or concern.

If he leaves they will kill him. He think he knows what is coming and he can't leave his brother to what he believes is death.

Higher stakes if the reason for him to get out is because his life is in jeopardy, not just his brother's.