If you have thoughts, that's good.
Vocabulary and grammar is the second question.
I know that many people are scared that their ideas will be too sophisticated, and there will not be enough words to express them in writing. Therefore, these students try to simplify their thoughts, weed out really worthwhile (but more complex) thoughts and, as a result, do not know what to write about.
Understand whether your problem is lack of ideas or lack of resources to describe them. The second problem is much easier to solve. Even if your level is high, but you do not know WHAT TO WRITE ABOUT, you will not have a quality essay.
Try not to make mistakes. review and analyze informal essay examples https://wr1ter.com/how-to-write-an-informal-essay
I have no doubt about your mental capacity and what you think regularly. But to write a great essay, you need to think a little differently, training critical thinking, analyzing the situation and examining it from different angles.
I am sure that you probably have a formed opinion on many issues and topics, it remains only to learn how to analyze your own opinion.