The author of CommonMark and Pandoc has a new format called Djot: https://djot.net/ that I've been meaning to check out. Supposedly more sane to parse, and it comes from someone who would definitely know about that sort of thing.
I like it, but it doesn’t seem to have a specification, making it hard to create a new implementation.
Wow this looks like a stricter, more sane Markdown! Great, will try it... sometimes.
Djot is great. I use it in my project ( client for https://timbran.org/moor.html ). It has all that I needed from markdown without any excess, and it's safe and easy to parse and familiar to people.
A little bit of a problem, as a Korean, is that the name “djot” (and also common word “jot”) sounds like a Korean slang for “dick” :/