The fact that so few people blog these days makes blogging even more influential than it used to be.

You can establish yourself as something of a global expert on some topic just by writing about it a few times a month over the course of a year!

Don't expect people to come to your blog. Practice https://indieweb.org/POSSE - Publish (on your) Own Site, Syndicate Elsewhere - post things on your blog and then tweet/toot/linkedin/submit-to-hacker-news/share-in-discord etc.

Also, don't worry too much about whether you get traffic at the time you write something. A lot of the reputational value comes from having written something that you can link people to in the future. "Here are my notes about that topic from last year: LINK" - that kind of thing.

There's a lot to be said for writing for its own sake, too. Just writing about a topic forces you to double-check your understanding and do a little bit more research. It's a fantastic way of learning more about the world even if nobody else ever reads it.