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So someone blacklisted me? Where can I get information on this as I don't see a valid reason?

There was no mention of blacklist. Check here to learn how Boosting works: https://ecency.com/faq#how-boosting-work

I see.

Just to mention, this is my own content, but I am not originally publishing it on Hive anymore.
I always provide links to the original as well as all the media I use.
If this is the issue I can't risk at this point publishing exclusively at Hive.
Anyway, I never plagiarised and always follow copyright rules providing links from creative commons images.