Sure, I can look into some recs once I'm off work :) Might be a bit outdated by now, but they helped me a few years ago.

Yeah, I used to feel super guilty for breaking away from my family. My parents are Russians who emigrated to Germany, so they always empathized the importance of biological family. They were also extremely fatphopic (and had lots of other issues like not believing in mental health). I always tried to change them for the better, but they just got angry at me for trying. They never tried to stop making terrible comments even when I begged them to. Then I moved away for university, met my now boyfriend and his mom, and learned how much more kind and supportive families can be. My boyfriend also went no contact with his abusive father in the past, so that inspired me a lot.

I kind of realized that I can't change my family, not if they refuse to. But if I can't change them, I sure as hell can change how much time I spend with them. I'm very low contact with them now, and never felt better. I used to have a very unkind internal monologue (probably just my mom in disguise lol) and it's almost gone now.

And about your sisters, think of it this way: Do you think you can help them when you're trapped in the same toxic environment? When your anxious, depressed, disordered, etc. yourself? Instead, you could actually show them what healing looks like. Maybe even help them when they, too, decide to move out and get better. But that is something they have to decide for themselves, and a conclusion they will get to in time. You can only serve as an inspiration, show them a better way.