Interesting! I journal a ton, and love the act of putting pen to paper, but daily wish I could write as fast as I think.
Here's a blog post that's unrelated, but you can see a little bit of my shorthand writing in the first photo.
https://www.friendlyskies.net/intj/modeling-and-detecting
I started with Ford Shorthand (.com) and then added onto it from there. Anyway, can definitely recommend.
I learned Quikscript in less than a week. From what I've heard, most shorthands take months or years to learn.
In my case, I have added my own extensions to Ford, such as representations of words and phrases, and have added on some conventions from Gregg as well.
IMO the distinction some draw between "shorthand" and "script" for example can make it needlessly difficult for beginners to get started.