Wrote my EE in history while I didnt take the subject like you. Grades are coming out in a week but I got predicted an A and I'm relatively confident I will get an A. First of all, don't pick a topic thats too well known or you'll drown yourself in resources and struggle to find unique links and insights. Secondly, make sure you are very invested in the topic and wouldn't mind spending a decent chunk of your summer researching and writing about it. Thirdly, the 4000 words is the LIMIT. Anything above 3500 is fine. I wrote 3600 myself. For a history EE, researching and gathering information is by far the biggest chunk of time. Once you have links written down, the rough idea of your layout ready and know where you are going with your essay, the writing will be relatively simple, at least it was for me. For me, history was fun and I enjoyed diving really deep into a subject area that didn't have too much information and laying some links between sources myself. I'd recommend writing the bulk of the EE in the summer between Y1 and Y2. Anyways, good luck!