Do any of these platforms provide additional discoverability? I occasionally publish articles, usually of the technical "how-to" variety with a focus on areas that aren't already widely documented. To date I have published these on Medium because if you publish via an established publication like Towards Data Science your articles can get decent reach without much effort. I'd ideally like to move away from Medium but as I am not well-known, without an established platform to provide visibility (or a lot of self-promotion) the reality is that no one would read my articles.