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There are several approaches to take for writing articles, from writing a bit I can tell you that one thing to always keep in mind is to make sure whatever you write is valuable to others (your readers/ target audience).
That said, here are a few things you can do to select the right topics
1) Keyword Research: find out what topics or particular keywords people are searching for, you can use tools like ahrefs for this
2) Search for Trending topics: there are generally topics from time to time that are trending and people find interesting. Artificial intelligence for example
3) Research competitors: this one I would recommend you do delicately, check out what your competitors or similar businesses like yours are talking about and find gaps or areas where you can present new ideas. Focus especially on competition posts that have the most views/ interactions
Another key thing is to look into the community for problems people are trying to solve, like I said always try to give value first.
You can find those topics by interacting with Atlassian Customers. If same question has been asked many times it's probably worth the topic. Good luck!