I often suggest that blog posts are a great way to contribute to the Elm community. Anyone in the whole world can write posts about projects like elm-spa or elm-tooling or elm-optimize-level-2 or elm-review or whatever else, and it does not need to be the authors of those projects. Creating those projects is hard enough on its own, and I am sure those authors would appreciate a surprise blog post from a happy user. If that happy user can get it on /r/programming or HN, hey, that’s great too.
Someone who thinks such posts are vitally important to Elm does not need to do any coordination with anyone else to make it happen. They can just do this. No one is blocked. It doesn’t need to be on any particular domain. Try to write the top post of /r/elm. Talk to people to get admin on there. DM people about questions you might have about a post you are writing. Etc. Take the initiative yourself.