For the above topic, would it be ok if i wrote about getting into a dynasty?
Discussing any aspect of a dynastic form of ruling would be a very vivid topic on which to write. I think that even prior to writing there has to be a level of thought and discussion as to what about the particular time period is within it that would allow you to be attracted to it. What about the dynastic time period is attractive to you? What did you like about it? When you discuss "getting into a dynasty," what do you think this involves? What would this process be like? I think that you need to address some of these issues and truly reflect on it before you start writing. Since the prompt is allowing you to choose, I think that you will need to justify your choice through written explanation and substantiation of your thought so that the reader fully understands why you have made such a selection how your fascination to it is evident.
From the nature of the question, it sounds like you can write about virtually anything. I love the idea of writing about a dynasty. (I assume this is part of your historical and cultural heritage.)
The main things I would remind you to do is to keep this essay as personal as possible. I think one purpose of this assignment is to allow your teacher to get to know you better. No matter what you decide to write about, you should definitely answer the question WHY. If you want to show your teacher that you have some knowledge about historical facts and details, this would also be a great time to write about what you know.