The bar is lower than common thought: uninteresting topics is a relative subject. The author's rule is anything that they’ve said more than once in a conversation.
There is also another effect in play: readers don't usually give this feedback, so it's hard to know.

So: lower your bar for what’s worth writing about! My personal standard is anything that I’ve said more than once in a conversation.

How?

1. Write consistently: every week and briefly, every day.
2. Notice and pay attention to feedback

Come with a good title: one that makes a promise about what the reader will get from reading the post that is (1) exciting, and (2) accurate.

Find the right framing. Provide examples. Use microhumor if you want to go for this tone. Write like you talk.