If the tutor says you need to improve your organisation or structure, you may need to rearrange the ideas in the essay quite considerably. This will take time.
It may help to start on a new document rather than working from this original one, and only moving across the information that you really want to keep.
Try to start each paragraph with a transition phrase or topic sentence. Imagine if the paragraphs were all cut up and spread out on a table. Someone should be able to put them back together in the correct order, and they should be able to clearly see which paragraph comes next. Try to think of that as you are writing!