For this problem, I have the following suggestions:
First of all, you can analyze the psychological problems that college students are prone to, such as depression, a typical psychological disease.
After making clear the mental illness that the video wants to express, you can write a microfilm script.
We can analyze the causes of mental illness from many angles, such as parents' incomprehension or school bullying.
Finally, we can choose the actors and shoot.
You can use exaggerated techniques to express the psychology and contradictions of the characters when shooting.
This kind of college competition generally requires the ending to return to positive energy, so it needs to show reversal and change in the play.
I hope my answer can help you, and I hope it will be adopted.