I don't know who to go to anymore about this

it's been over a year since my older brother started sexually assaulting me again. over a year of me trying to get help and being pushed aside or not believed. My mum doesn't believe he'd ever do such a thing, even though it happens multiple times a week. I've gone to both my counselors at school and nothing got done. one of them had completely stopped seeing me after he told me he'd see me for our next session (never happened). even the police here are absolutely incompetent and don't do shit. I'm so tired of being scared in my own house. I can barely sleep most nights and it affects my school work since I fall asleep during class so often.

this first started when he was 7, and I was 5. it stopped when I was around 11, and it all started again when I was 15. I am now 16.

I've told a few very close online friends about it, but realistically what can they do? the most they can do is be there for me, and one of them stays on call with me while I sleep in case anything does happen i don't feel as alone.

I don't know who to go to anymore, or what I can do to keep myself safe.