Is there a chance my prior sentence to be reduced?

Is there a chance my prior sentence to be reduced?
I was charged with a Felony D for possession of controlled substance Except 35 grams or less of Marijuana, Misdemeanor for unlawful possession of Drug Paraphernalia, and Possession of Marijuana Synthetic Cannabinoid of 11-35 grams about a year ago in Daviess county, Missouri. I’m on an interstate compact living in North Carolina. About a week ago, I read a news article that Felony D charge for Cannabis can be dropped down to Misdemeanor. I am on SIS probation until September of 2020. Is it possible to drop the felony charge to a misdemeanor now? And what do I need to do to get my charges dropped?

Justin’s Answer
I am not familiar with any way to reduce the charge after you have pleaded and are serving probation.