Please follow these steps to complete your task:

1- Decide the area of your assessment: what?

2- Theory and research design being used for the assessment: How?

3- Purpose of assessment: why?

These points may help you decide and narrow down your research title.

I agree with Muhammad Amjad Bashir . Additionally, you can consider organising trial lessons where you demonstrate the effectiveness of certain teaching tools or materials (AI? audiovisual materials?). For instance, you could consider the use of AI tools to improve second language learning, or you could verify whether exposing students to film extracts in an L2 (with subtitles) can improve their language skills, etc.