It really depends on what your weaknesses are on your application. If its your GPA, a post bach degree would be a good option. I had a poor GPA after undergrad and ended up doing a one year masters. Graduated with a 4.0 and all the schools I applied to loved that. If your OAT score is low you might want to retake it. I know people can get in with low OAT scores like 300 but most likely they had a high GPA to counter that.
Sometimes schools want to see more shadowing, volunteering, or extracurricular activities. If that might be the case that's an easy fix.
From what I've seen on multiple forums, it looks like the average GPA is around a 3.4 for all schools and a 320-330 OAT score. Also, contact the schools you applied to and see what they have to say.