The biggest mistake I did was submission of my articles to around 200-500 article websites.
It triggered duplicate content penalty. Google assumed that my own site is using duplicate content. :no:
Since then I have never indulged in article promotion or I would call it duplicate content promotion :bullshit:
Unless and until you receive back link from your own published article, you are at a great risk of receiving duplicate penalty.
I barely do Article Submissions, but when I used to, my site does not have a copy of the article, so I am not penalized. And the article has links going to my site.