I got sideswiped this a confluence of factors that finally convinced me to resurrect a decent static site generator (hi Pelican!) and bring this blog back from the relative dead.
In fast succession: Medium finally locked all useful distribution they do behind an even stronger paywall, I read this article by Fred Wilson on the value of being self-sufficient, and the one and only patio11 kindly responded to some of my questions about how to bootstrap a fledgling website no one visits out of the cold start problem.
So I'm going to primarily be writing on my own blog (e.g. this post at http://www.locallyoptimal.com/blog/2019/03/24/publish-independently-publish-often/), syndicating posts across to Medium for a least a bit, and seeing how it goes.