Here are some good literature reviews that can give you some ideas for further research on ESG:
Daugaard, D. (2020). Emerging new themes in environmental, social and governance investing: a systematic literature review. Accounting & Finance, 60(2), 1501-1530.
Widyawati, L. (2020). A systematic literature review of socially responsible investment and environmental social governance metrics. Business Strategy and the Environment, 29(2), 619-637.
Huang, D. Z. (2019). Environmental, social and governance (ESG) activity and firm performance: a review and consolidation. Accounting & Finance.
And also a few papers with possible ideas:
Arayssi, M., Jizi, M., & Tabaja, H. H. (2020). The impact of board composition on the level of ESG disclosures in GCC countries. Sustainability Accounting, Management and Policy Journal.
Del Giudice, A., & Rigamonti, S. (2020). Does Audit Improve the Quality of ESG Scores? Evidence from Corporate Misconduct. Sustainability, 12(14), 5670.
Verga Matos, P., Barros, V., & Miranda Sarmento, J. (2020). Does ESG Affect the Stability of Dividend Policies in Europe?. Sustainability, 12(21), 8804.