There's a theory that Schizophrenia is a metabolic disorder. The idea is that adrenochrome, an oxidated metabolite of adrenaline, builds up in the body causing hallucinations, among other things. There is genetic issues pertaining to the methylation cycle which causes over-methylation in some people. This can heavily affect the glutamatergic system as well, so there's a few different pathways that can cause psychosis.

There are a few remedies that have some research, but since they cannot be patented and sold as pharmaceuticals they get little attention. The main ones I am aware of are Niacin (Vitamin B3) and Glycine (A natural component found in gelatin). Sarcosine, a glycine receptor inhibitor, is also shown to give improvements in symptoms. Anything else that is known to reduce inflammation in the brain like Nicotine can help as well (Fun fact: almost 90% of people with Schizophrenia were found to smoke or use Nicotine)

Whether these would work individually for someone is obviously a question that is up in the air, but the point is that there is an alternative to giving up and accepting whatever doctors tell you to do. Of course, occasionally this is the only option available that works. Some people need to be on medication, someone has to be able to deliver my amazon packages while being able to accept the crushing work conditions.