All I can suggest is try to make contacts with other medical personal who would like to join you and take if from there. I would guess some of your professors might be of some help.

Perhaps you can go to one of the community health clinics and set up free screenings and educational programs. Perhaps at one of the childrens centers, you could educate the young on nutritional programs, excercise, etc. (obesity is a problem) through the use of a “show” or have some volunteers start a softball league, peewee football etc. Show them the positive fun of excercise and better nutrition. Get them while they are young! This will abate long term health problems.
My son is a doctor too, so you go and make this a better, healthier world!! Congratulations on your choice of careers, and yes, you can make a difference!!!

Different countries and states and local laws probably put limits on what you can actually do.

Have you thought about having a health fair? Offer blood pressure screening, diabetes testing and other preventative educational services. Think of the children too if you have a fair.

If possible, you could start a low-cost, or free, medical or dental clinic, or contribute your time to already established local clinics.

Good Luck!