In your position, I would go to an AFCO debrief, join the TA or become an adult instructor in the ATC, join a team sport, arrange some adventure training for the summer and look at getting a management career. By the time you've arranged all of that, a year will fly by. When you go back to OASC, put down Officer and NCA if you are interested in both.
They obviously saw something in you, and told you to work on yourself and come back in a year to try again. If they really saw no Officer potential in you, they would have told you never to come back again.
There is no rush to make any sort of decision now, so try not to rush into joining the ranks because you want your career here and now. A year is no time at all. For varying life reasons I've been waiting seven years for mine to start.