Write that blog post, even if someone else has written about a topic before.
Maybe people who find your post, haven't seen the others. Or the others didn't articulate the points in a way that resonate with the reader. And most definitely, the other writers didn't have your lived experience so your perspective will be unique.
https://hamatti.org/posts/but-someone-already-wrote-about-it/
@hamatti agreed.
I generally check and reference other work though, and I think that worked out rather well so far.