I've moved this post to the Server Admin space of our Community where you are more likely to receive a helpful response.
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There is a new tool that may help migrate. Please keep in mind it is a unsupported tool.
I have yet to try it out myself. I may experiment with it soon, or if others have experience using it maybe they can chime in as well. It sounds like it should be able to move data sources from Tableau Server to Tableau Online. I would make sure to take a backup of Tableau Server before proceeding.
It's called TabMigrate and it can be downloaded here:
The .exe can be downloaded here: Releases · tableau/TabMigrate · GitHub