TBH I wouldn't focus on the plot so much.
Creatives in English, with the exception of Ext 2 English, are rarely plot driven - or the ones which do well are rarely, due to that you're writing only 800- 1000 words and not a novel. Ideally you want to be conceptually driven instead. Your creative is your interpretation of a given theme ie identity, and so you would want to show the multifarious and complex nature of your theme rather than focusing on the plot. I would personally brainstorm the different aspects of identity and think about how you would integrate that into your creative, keeping in mind that although plot is secondary to conceptual issues, you do need a setting, characters etc.