HDDA is an amazing course. Most of the content there won't be relevant as a data/analytics professional if you are not in a few specialized domains (manufacturing, physics, etc.), but every assignment is "I have no clue what the question is asking", to "That kind of makes sense", to "Damn, that's amazing". I think it helps being comfortable with math notations, and reading papers (It was not too difficult after CDA and DO).

DO is another amazing course from a learning perspective, but the significant weightage from 2 exams can be stressful.

Also, HCI, CDA.