The attached link to another doctoral thesis had a behavioural finance element and concluded with some potential additional research topics that may be of help or may spark some ideas related to your own field:

Thesis An analytical tool to aid the reflective selection of equity...

https://repository.mdx.ac.uk/item/840x6

1. Literature Review

Conduct a thorough review of recent research papers in behavioral finance. Use academic databases like JSTOR, Google Scholar, and university libraries to find the latest articles and papers.

2. Identify Themes and Trends

Look for common themes, trends, and topics within the literature. Identify what issues are currently being addressed and which ones are gaining interest. For example, topics could include investor psychology, market anomalies, risk perception, or financial decision-making.

3. Analyze Research Gaps

Read the discussion and conclusion sections of these papers carefully. Authors often highlight the limitations of their studies and suggest areas for future research. These suggestions can be valuable for identifying potential research questions.

4. Consider Practical Relevance

Think about the practical implications of potential research questions. Consider questions that could have a real-world impact or address current issues in financial markets. This can increase the relevance and applicability of your research.

5. Formulate Specific Questions

Based on your review and analysis, start formulating specific research questions. Ensure they are clear, focused, and researchable. Avoid overly broad questions; instead, aim for something that can be explored in-depth.

6. Check Feasibility

Assess the feasibility of your research question. Consider the availability of data, access to resources, and the scope of your study. Make sure you have the necessary tools and methods to answer your question.