Trying to put myself in your shoes (failing, of course) and, if it were my brother, this is what I would do. I’m going to assume that the tumor is cancerous and not benign (a misnomer, to be sure, as any tumor in the brain is serious)
Immune system recharger. Cancer has a way of hiding from the immune system, so a jolt to it might really help.
Hyperbaric Compressor. Cancer thrives in a low oxygen environment. This would be the opposite of that. No more than a hour a day (or less depending on his condition)
Anti-Cancer 2.0. Obviously.
Fungus Destroyer. Fungus also thrives in a low oxygen environment. There is a fungal origin theory of cancer, but the main thing is that a fungal infection is not helping. (I’m sure some mushrooms help, but that can be tricky.
Plasma Flaunt. The thread is very reassuring. It definitely seems like the go to field for a health crisis.
Blueprint of Life. A brain tumor is not part of the design specs, so a return to the original blueprint seems reasonable.
Emotional release and stress reduction. Stress and cancer go together and that’s not good.
I’d research the M-state fields and plasmatron.