re: Question about career move

Where do you live? What are your career aspirations? Family situation? Willing to relocate?

I think more information is required before a recommendation can be given. In sales, your undergraduate degree isn't going to matter much unless you get into technical sales like medical devices. A MBA may make sense of leadership roles are your aspiration. If you don't have a solid business background then the skills through a MBA would likely be very helpful for you. Understanding your background and ambitions will help a lot on determining a path forward.