It is ok to repurpose your articles, content, and images, but change up the timing of when you share your repurposed articles on LinkedIn. And by change up the timing I do actually mean wait three to six months before you post that article. Then as you are getting ready to post the repurposed article you have the opportunity to see if you can tie your repurposed article into a current event.
Endorsements are LinkedIn’s way of verifying what you say you know. Yes you have complete control over what skills and endorsements are visible on your profile!