When you come across a news article or trending content related to you IG topic, you can stitch or piggyback on the article.
For example, has been doing Instagram posts on chocolatiersin Brussels. I saw this piece from The Economist about saving the chocolate industry of the world.
It might be interesting to piggyback on that, how in the Belgian chocolatiers, of course, aren't part of the problem because they have the fabulous chocolate.