If it is rather difficult for you to write articles, one possibility might be to outsource it. There are a ton of great content writer on the web..
But if you prefer to write on your own, I found tools like the readability test tool, grammarly, readable.io really helpful - they show you where you should use different words/phrasing, if you are using too long sentences, too much passive voice etc.
Another tip that I learned is in order to create an interesting article you should try to hook your readers with questions. (Brian Dean is really good at that) this is one of his articles on copywriting backlinko.com/seo-copywriting
Hope this is a little bit helpful to you!