Working full-time is painful but part-time is not enough

Hello. I've always been employed but it has damaged my mental health and managers' responses have traumatised me. I now work two nights a week which is ideal because I work alone in a warehouse. I haven't had a meltdown in over six months - a miracle! BUT I can't live on this. I still live with my parents at 45 and they are very anxious about my future because I can't support myself. I'm not great at saving money and no longer earn much. The problem is that most people don't understand Autism and I look like I can work. I pass as neurotypical, if not a bit eccentric and anxious, until people have known me for over a year and see me fall apart. I feel invisible. How do I get help? what happens ten years from now when I am forced to move out? I don't want to have a relationship and prefer to be alone, away from people, so I don't know how I can live? I have a lot of anxiety about this. What do I do?