Again I am here to help you write your thesis proposal, but in order to progress with the proposal we must first have some faint outline of the thesis. Just as one discerns the hardened criminal within the tender first-time offender, one must foresee the thesis within the proposal. Fortunately, all finished theses look alike. All finished thesis make a certain point about a certain topic by making a certain argument using certain terms. Before I discuss your topic, point, argument and terms, all of which your proposal will profess and your thesis actually possess, I will make another generalization about all theses.
All theses have the same structure.
If it could be done perfectly, it would produce the perfect thesis. But perfection, I hate to be the one to break it to you, is a lie. It is good that no one demands perfection from the thesis proposal because the proposal, by its very essence, is an impossibility. But as we have already shown, the introduction is the last thing you write. So the proposal is not an authentic introduction.