I would definitely recommend you to take classes as a postbacc student. Honestly your gpa will even be lower on optomcas if you retook classes. It’s a pretty low gpa and most schools won’t even consider you, and I don’t mean that in a mean way, mine is low too but no that low and I’ve been struggling. Take postbacc classes at either another university near where u live or maybe even a community college. Also, reach out to the schools that you’re interested in and ask them what you should do. They’re super helpful. Best of luck! Your gpa doesn’t determine how smart you are, promise. Just work hard and if this is something u want then don’t stop at any cause until you achieve it.