I think you are over thinking this. Better to get a job and see if you enjoy it than try to predict your impact on the world around you before you actually do anything that would create an impact.

I'm replying to your other post which was about electrochemistry. You can take a look at this project for building a DIY device for electrifying the body for health benefits, which is similar to iontophoresis devices. https://groups.io/g/germkiller