Apply again to your 3 South Carolina schools. You could also try these:
New York Medical College
Medical College Wisconsin
For DO schools consider these:
VCOM (all schools except Monroe)
PCOM (all schools)
You definitely need more service orientation to add to what you had before. You already have 500 hours as a transport and a PCT so you can get some clinical hours but focus on the non-clinical volunteering like shelter work, job placement services, or housing rehabilitation.