Your competencies and experiences are more important than whether you get a minor or not. But, three more classes isn’t a lot. Are you interested in studying or doing an internship abroad? If so, you might be able to get all or most of those credits that way. There are programs where you could do a business internship in Spanish, and this could be great to have on your resume. (Example: Programs>Brochure>Study Abroad ) Or, there are traditional semester-abroad programs that offer Marketing coursework. (Example: Programs>Study Abroad ) Often, coursework in your own major will double-count toward a foreign language minor or major if it’s taught in-language.
So, I wouldn’t necessarily just start churning out Spanish classes for the sake of finishing a minor, if those classes don’t otherwise interest you; I’d look first at what opportunities you might really be excited about, and then see how close that would get you to the minor and what additional classes you might or might not need to round it out.