I'm sure you write more words on social media in the same span it'd take to write that many words for what's essentially a homework assignment. If it's something you're passionate about, it should be easy.
Honestly, when I was at university, I wrote easily (well not easily) 15 pages typically for papers meant to be 2-10 pages...admittedly, I came home from the campus library daily like 4am to finish these papers, and with how I did on my modules, if I had left then and there I'd have a first. Unfortunately I dropped out with modules worth maybe a 2:1. If I stayed long enough to write a dissertation, I don't think I would struggle. Three really is a process I learned:
First, write the thesis. The topic. The statement. The question. The hypothesis. The goal. The study. The comparison. The observation. The opinion you're trying to prove. Whatever.
Then answer it in bullets. I love an outline, me. Each bullet is a subtopic. Each answer is a cited source and a few paragraphs. Segue your subtopics and put it all together at the end. It's not easy. But it's simpler with a subtopic. It gets fun once you answer the bullets and outline the subtopics.