Consider the purpose of one of your essays. Pretend you are a member of the target audience. Read it. Your experience of your essay will tell you a lot, and is

Consider the purpose of one of your essays. Pretend you are a member of the target audience. Read it. Your experience of your essay will tell you a lot, and is all the guidance you need to become the best according to your judgment/taste. Though it will not enable you to improve beyond... For that, you need to read expert writing, and perhaps an expert-coach of some kind.