Part modification

I have a part that needs to be better smoothed out on the surface. I still see lines and small faces on the surface so is this something you can do? I need someone who is very great at smoothing out surfaces and the file would need to be in a step file. Im looking for the best price so let me know how much will something like this cost me. Please let me know if you're interested thanks! If so i would need your email so i can send it through wetransfer