Optimize CAD file (.stl) for prototyping

I am looking for a freelancer to optimize a CAD file (.stl) for 3D printing. The CAD file was created using Vectary, and I'm not sure what modifications I need yet, so I will leave it up to the freelancer to decide. I'm looking for a freelancer who is experienced with CAD optimization and can ensure that the file is properly set up for 3D printing. This project needs to be completed quickly and efficiently, with quality results. If you have experience and think you can help, please reach out and let me know what you can do.