Dear, I have an MBA from Maastricht school of management and I am an employee at

Dear,
I have an MBA from Maastricht school of management and I am an employee at the Kuwait Aviation Fueling Company, which is one of the Kuwait Petroleum Corporation. I am thinking to apply for PhD in the UK.
I need your help to choose an appropriate PhD research proposal which is important for the future. I am thinking about two different topics that are (Innovation or Sustainability) due to their importance.
Let us focus on the management side, not technical because I am not an engineer, I have no experience with the technical side. Based on what I read, there is an innovation from the organization side, strategies or management.
Take your time for reading and let me know once you choose several topics so we can compare between them. Or if you have better ideas than innovation or sustainability, please share.
Please send me about 7 or 8 topics. after that we will work on the PhD proposal.
Thank you.