Maybe. Maybe not. Depends on how good the course is, how well you study, what you learn, and what you do with your added knowledge and skills.
Your “five-year plan” sounds more like an expectation, or a statement of hope. A “plan” is for things you will do, not things that you think will happen to you (such as a promotion). Similarly, your goals are things you intend to accomplish, not the rewards you anticipate you would receive.
I assume “iMBA” means “internet MBA”, or the modern equivalent of what used to be known as a correspondence course. That type of education is simply guided self-study. There is no actual teaching involved, no interactive learning, no involvement with classmates. Just reading some assigned material, or watching some videos, then taking some open-book exams, and in the process considering yourself as becoming educated.
Historically, such self-study degrees have little credibility or value in the marketplace. They serve mainly for ego satisfaction, so that one can boast “I have a college degree” or in this case “I too have an MBA”. The reason such a degree is not helpful in sales is that you would not learn anything practical about selling. If you transfer to another line of work, I rather imagine you would also find that the degree taught you nothing useful about marketing, or finance, or accounting, or management, or anything else. You might have picked up some vocabulary, and some core concepts, but it is very unlikely that you will have learned anything of practical value.
It sounds to me like you need to do a lot more thinking about your career. In the meantime, keep plugging away at selling things, and bringing home the commissions. Make sure you save some money.