I was going to post something very similar in the lines of what has been said.
I think you've done your bit to show that you're still interested in the school. Now it's all about articulating why they should still be interested in you.
What have you done since last year that makes you a more mature and accomplished candidate?
For example, I am a reapplicant myself and this is what I did.
1. Got promoted at work. If this hadn't happened I'd have taken up a big project and seen it through (though my promotion entails that already). If that was also tricky, I'd pick up a community volunteer experience 20-30 hours a week and build something strong.
3. I retook the GMAT to gain more than 20 points and as a result I am now significantly higher if Ross' average.
3. I modified my career vision as last year my goals were murky and flawed at best and terribly planned at worst.