Bring CMYK colors as close to RGB as possible

Hi All, I have made two posters in different sizes in RGB colors and had them converted to CMYK colors for printing. However as most of you know the colors became very dull. I'm looking for an expert who can bring the colors as close as possible to the RGB colors and send the files back to me. An expert should be able to finish this job within an hour, so do not bid high! PM me, I'll send you the poster in CMYK and the original RGB poster, so you can show me what you can do. Payment will be upon delivery via paypal. no upfront payments. I'm in a hurry to get this done so bid fast! Regards