substack is the way to go, it has an app that you can download. substack is kinda like twitter for writing.
there's also psyche.
low-tech magazine - powered by solar energy, really cool for more technology-oriented articles
literary hub - literary articles (you can also find reading lists, news from the publishing world etc.)
Substack has taken over my daily reading with amazing newsletters by smart people. What newsletters do your favorite newsletters read? This mind-mappy image (see link for more readable version) will give you days of new reading.
Every once in a while I scoff at what I was required to read in school and then I remember we read a modest proposal and actually my education was quite well rounded, thank you
