There are many experts here. You can follow some of them and learn from their articles. I am not an expert but here are some pointers from my end:

1. Write articles that people can resonate with, solve a problem, or have some genuine takeaways.

2. People also love humor, and stories. It's better if you add your perspective.

3. Reading something and writing about it is okay but without your personal touch people won't enjoy it.

Here is an article I wrote on what type of articles should you write on Medium. I hope it helps.

https://medium.com/swlh/what-kind-of-articles-should-i-write-on-medium-5925d47f9bed