15 ideas to generate content about your expertise
1. Write about "some of the best in the industry"
2. Write about one company or person that messed up
3. Write about your failures
4. Document your process
5. Interview someone
6. Share an unpopular opinion
7. Share what other experts have said
8. Write about a different industry or craft in a way that can be connected to your expertise
Let's say you're a graphic designer. Maybe there's something to be learned from a story about a novelist.
9. Summarize content you've consumed
A book, a podcast, an article, ...