I would add strong thesis to the list. Personally, I think it is the most import part to any essay. It lets the reader know exactly when the essay will be about and it should captivate the readers attention. I have used this site in the past: https://johnmcgarvey.com/apworld/student/thesiscreator.html It allows users to break their thesis down into sections so they can really think it through. I have also referenced this roundup list of helpful online tools to help write essays: https://www.coursehero.com/college-life/10-helpful-online-essay-writing-tools-explore/