I would suggest using Deap Learning techniques in the same area of your current research.

Maybe it could be interesting the semantic similarity between words/sentences/documents. It has many useful applications and you could develop a proposal jointly with an tangible case of study.

How about looking at deep Subspace Clustering.

What about if it is "Machine Learning for Climate Change Analysis" topic?

Pampa Howladar

Are you asking or answering?

You could have a look at ontologies and machine learning: Article Ontology Matching: A Machine Learning Approach

I believe there is a serious research deficit in this area!

Cheers, Raoul

Artificial intelligence for data mining and warehousing in Covid era and beyond

Great! You can use ML to feature & visualize the patterns in Healthcare systems especially related to the readiness of defending infectious diseases in third world countries.

There is a growing interest in applyling machine learning to physical sciences, e.g., data-driven turbuelcen closure modeling, sparse-based discovering of governing equations, deep learning-based predictive modeling of chaos.

customer sentiment analysis for different car segment

You can look at fake news or hate speech using deep learning.

human language evolution and change

Try to develop an interpretable machine learning (deep neural network) model for text mining.

You can go for, Integrating text mining with information retrieval towards designing an intelligent search engine that is discovery driven, rather than just query driven..