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Looking for ideas for NLP research

I am hoping to get a sabbatical sometime for six months. If it comes through, I’m planning to spend the time on NLP research. Even if it doesn’t come through, I’m still planning to spend a lot more time on NLP research – which leads me to the question.
Question: If you were to choose an area/application of NLP that is very worthwhile researching, what would it be?
I have lots of ideas myself already, and would love to hear lots more.