No, schizophrenia is not good. It didn't "grant" you any astral powers, if that is what you are asking.
The problem with these mental issues is that this influences the direction of energy by a person. If such a person had empowered themselves to a strong degree, then this power of their soul turns against them, in the case where they start acting destructively.
In the case where the individual has problems of the upper chakras, like hearing voices, then it is possible for empowerment of the upper chakras to amplify this, as it is adding energy to a broken machine, so to speak. That doesn't mean empowerment is totally bad here, but I believe it should be down carefully, with more focus on the lower chakras.
Some activities should be prioritized over others. For example, the power which comes from cleaning or hatha yoga is the result of increased purity and balance, respectively, rather than just raw energy being added.
Eventually, more direct solutions should be sought out. Although it is good to target problems directly with energy (like Satanama to correct one's mind), the problem is that this will cause a pushback, resulting in temporary instability. This pushback will test their resilience, like their degree of grounding, but also their astral sensations, too. Positive affirmations and protection help one deal with this, and the problem will get better, but it can feel worse before that point.
So I would say the person should spend lots of time grounding themselves, working on the base chakra, and using earth energies like Nauthiz. Only at a safe point after this prior development would I start more direct workings against schizophrenia, such as using Wunjo or Berkano. Ask your GD for guidance, however, as they would know exactly what to do.