Seeking advice on a family trial and feeling distant from my deen

Assalamu Alaikum everyone. I honestly don't have many people to turn to right now, so I'm hoping to share what's been weighing on me. I embraced Islam five years ago, and while my life before was full of hard tests, things actually got tougher afterward. I come from a non-Muslim household-I'm the only one who reverted-and what originally led me to look into Islam was being afflicted by sihr. Alhamdulillah, I'm better now, or at least I think so. But I've always had a feeling my whole family might be under the influence of black magic, since we've always had so much conflict and resentment between us. I lost my mother when I was eight, and my father passed away not long after I became Muslim. After my father's death, one of my brothers started showing signs of schizophrenia, but I'm the only one in the family who sees that this is from magic and not just a medical issue. I eventually got him to say the shahada and he started learning about Islam. We tried ruqyah several times, but the jinn inside him seems to do everything to avoid healing-whenever I talk to him about the deen, the jinn squeezes his head and confuses him until he's exhausted and can't listen. He also sees and hears beings in different forms, talks to himself, and lives in a very messy, unclean space. I'm just exhausted, honestly. My sister and other brother don't really believe me or help me convince him to get religious and medical treatment, which he really needs long-term. After five years of this, I'm struggling with my faith-I feel like Allah isn't giving me a way out, like He's forgotten me. It's hard to keep going when I have no one; I haven't even been able to get married, and I feel stuck in every part of my life. Please, I'd really appreciate any advice you can give, and if you could make dua for my brother to be healed, that would mean a lot.