One of the aims for low word counts is exactly to make it more challenging. If a client comes to you with a situation they are in, they will expect the law and your opinion on the case to be clear, concise and not very long to prevent any confusion.
It's great that you are knowledgeable to have a lot to talk about but I have found (third year law) that the word counts are just right. In my first year in formative essays, I used to go way over the word counts and complain to my tutors that there wasn't enough room to express what I needed to say. Turns out, if you go over the word count, it means you're babbling and talking unnessecary bullsh*t.
The word counts are usually more than enough to be clear and concise about the issues you want to raise. Do not go into massive descriptive details that aren't relevant. If you're unsure if it's relevant, cut it out anyway.
You'll get the hand of it in the future. I struggled with word counts at first. The word counts aren't usually raised either, unless you choose to do a dissertation which will be 100% examined by your one essay, so will obviously need to have a high word count. Apart from that, most word counts are 1500. I have never done a higher one. Apply it to the real world, would a client want to read two pages about their divorce proceedings or five that drags out unnecessary rubbish that will confuse them?