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Write a blog (history is valuable here, speak on Podcasts, Present at Conferences, be active on social media.

This can lead to people offering you positions that aren't publicly posted, because via your engagement they feel they understand you enough that you should be able to fill the role they have in mind.

For example - I write 20 blog posts going in depth on some topic - there's a decent chance I may actually know that topic. When that skill set becomes critical to someone - the odds are higher they'll contact me for that skill set because chances are, I'll be top of mind through sheer volume or quality of information I have written about that skill.