There are also scholarships students can get for MPH programs. I believe the largest ones tend to be about half tuition. These usually go to students with high grades and test scores as well as relevant background work (public health-related research in college; internships or work experience in the field; etc.)
I don’t know if there really is someone to consult, at least not specifically for how to finance graduate school. Most graduate school funding/scholarships are given by the school itself. You could probably find the majority of third-party scholarships/grants by poking around online.
Public health might be an eligible field for the Pickering Fellowship: https://pickeringfellowship.org/graduate-fellowship/overview-and-eligibility/. I’d contact the program and ask, since it’s not listed explicitly.