Substack looks great, particularly with the new Notes feature/Twitter clone. But it falls short for me in a couple of ways.
A combo of Notion + Super + my own Stripe integration+ Beehiiv (though I’ll have to copy/paste in here) is probably better than Substack.
Or there are some new Notion → Email newsletter options.
https://www.indiehackers.com/post/create-and-send-beautiful-newsletters-with-notion-ff9a0815ff
https://www.notionmailer.com/?source=indiehackers (waitlist)
Other good writers have their own platforms too. Stratechery & Every. Note they have both expanded from one to many writers.