Rn need some advice

Hi I’m a 30 year old looking for some advice. I started my career as a certified nurse assistant during and after my associate degree in general studies (3.0 gpa) I received my LPN in 2013, associate degree in nursing in 2015 and BSN in 2018 (3.7 gpa) Total gpa Probably is 2.6 or 2.7. I didn’t think my grades matter at the time so I didn’t work on it. Now I am interested in pre med and I want to know if I can still do it. I have 3 years experience in nursing home as a nurse, one year in a clinic, and recent two years in the hospital ER.
Should I do a Master in Public health along with science pre-med to improve my writing skills also my GPA ?
Or should I go ahead do a post bachelor with science courses instead?