What branch helps the masses?

I am currently in nursing and I am wondering what branch of nursing to commit to. As the title says I am wondering what branch helps the most amount of people. I know my goals which are to help the most amount of people I can. I am heavily community oriented and people oriented. Anything I can and have to do, I will. I know it’ll cost my time, strength, and energy, but I will do it if it means someone can feel better. I am fully committed to the people and I just want to go in that correct route so I can do what I feel like I’ve always wanted to!
Thank you in advance.