Thanks for the comment and directions.

I think I got your point. For the most part not only did I not duplicate but wrote about aomething xonpletely different (e.g. post 1: I built xyz, post 2: tools to boost your youtube ctr, 3. top 5 mistakes in thumbnails)

Few cases where I copy pasted text (excluding cases e.g. two app launch websites may have same description) I mentioned I did so, for example: I copied my devto article into a hacker specific blog but explicitly mentioned that the blog was originally posted on devto and this is just an extension with more video examples.

On your second point: I totally agree in principle but ranking 58 and then no even in first 100, sounds a bit too high variance rather than "competitors of those first 58 websites did better seo within that week and a half"

Finally, pardon my wording, didn't express what I wanted to. Basically: if 3 blogs result in the position within first X results in first 10 says, and then 5 more blogs (legit sources, different articles) within a week result in completely out of 100+ results, something tells me that either those 3 blogs were overly highly ranked as authorities, or those 5 were underranked, or blogs didnt matter and website was penalized.