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No offense onlinesource this is the type of content that Google targeted and from the post looks like the traffic loss was probably for the most part deserved.
The sites are pretty much done without a huge amount of time invested in them. My best guess is you will let them die, and probably for the best.
I was going off the OP post in the quote. The day of running a pile of sites alone is over IMO. I can manage a fair number but no were close to the numbers I was.
While it might take a while after cleaning up I believe Google would be able to notice the positive difference as this definitely sounds like an algo trigger rather than a manual penalty.