Military contract, help Army?

Ok, so I enlisted in the US Army DEP about 6 months ago and I signed on as a 19D option 4 for 3 years and I recevied a $5000 bonus. I only realized recently while looking at my contract that I signed on for 3 years, I wanted to sign on for 4. Is their any way I can get a year added on. I was told that this would cant as a reno, and a reno would cause me to lose my bonus, is their anyway I can get a year without losing my bonus?