Since you're not applying until next year, you have an opportunity to build your resume. Our
Admissions and Application Advice section provides some tips relevant to your particular background.
Your ECs can be used to show leadership experience and skills, but explore any and all opportunities to do so on your job. That should be one of your priorities.
You've targeted solid general management schools that are appropriate to your goals. Keep UNC on your list. For finance, you might explore NYU Stern, and for marketing, you'd be competitive at Indiana Kelley.
Raising your GMAT score to 700+ would definitely be to your advantage. I also notice your AWA score is a bit on the low side for a native speaker.