Wow, that’s complicated. I guess you have to figure who are the people who are going to read it. Since readers are mainly women … or you could turn MC into a guy or even into a teenage girl since her parents are dead anyways. There must be something relatable. Now of course it depends on weather you want this story to be extemely sucessful or just experimental project.
It could be less complicated when you start with 2-3 characters only in the first capter so the readers can get to know MC better, relate and engage so they will be inteested what happens next. Then in next chapters slowly bring in rest of the characters. It must be really clear why they fight, why they hate or even why they do what they do - being a mob. You have to actually explain because in case the reader is 13-14 y/o. They will not understand and you also would need to express somewhere in your story that being a mob is bad - dont be a mob or else… blah blah. Yeah this is where episode’s new rules are leading us. All you can write now is a childrens bed time stories.