Freeborn Sound Studio is not a mastering studio. I have occasionally done mastering for certain projects, especially for projects that don’t have a separate budget for mastering (mastering studios can be very expensive!), and I do have some good equipment for mastering. But it’s almost always advisable to do your mastering in a studio that is specifically set up for mastering, and with someone other than the one who mixed it, preferably an experienced mastering engineer.
That sad, I have heard both good and some very bad results from both expensive and cheap mastering facilities. It is as important to choose a mastering studio that fits your needs as it is to choose the right recording studio.
I have a few recommendations for places you might try, depending on your needs and budget. Just ask!