Solipsism is no more true than any other perspective. I understand the desire to help. But you would help them much more by using that desire to actualize yourself. Actualized people are awesome! If you've ever met one, they're kind, patient, empathetic, intelligent and loving people. Simply being around an actualized person is therapeutic. So if your desire is to help people, actualize yourself and you will help by simply being yourself.
Solipsism is a story. See your hands? Now tell me more about how you're the only consciousness in existence.
Now look at your hands again. You've only told yourself another story.
Even if it was 'true', the thought of solipsism/nonduality is even more transient than your hands. Really consider that.
Free yourself of this belief. It only distracts you from actuality.