It's all good. I just asked about your needs so I could give customised recommendations. :)
A popular option for folks that need exact spellings is Callendar's Orthographic Shorthand. One of the /r/shorthand regulars digitized the instruction materials. It starts off as a simple alphabet replacement, then layers on more space and time savings. On the Fediverse, @masukomi@connectified.com has been posting her take on it.
An easier and more compact option is Ponish. The manual is... eccentric, but the system is solid. It's a modernized version of the 17th century Tachygraphy system by Thomas Shelton. Because no characters depend on size to differentiate, you can write as small as your hand will let you. There is a lower speed ceiling than "Orthic" unless you do some system development of your own. I've got ideas for improvement, but that gets into the weeds.
Two other options worth mentioning: Sweet's Current & Schlam's. They look and feel more like cursive. The former gets complex, but it's uniquely beautiful. Both are available on /u/Filalethia's comprehensive shorthand archive.
I'll try to contain my jealousy over the ReMarkable. ;) I've wanted one for ages.
That's the biggest problem with everyone doing the corporate socials' enshittification cycles instead of POSSE and/or independent services. Cool communities just fracture and die.
I've tried to get people to see this for decades. Maybe it'll finally enter the zeitgeist this go around.
If I recall, the rule of thumb is orders of magnitude. If you have 100 active users, there are probably about 1,000 lurkers, and only 10 substantial users that account for most of your content.
This is the rule from corporate marketing stats, tho, so who knows if the Fedi works the same.
Shorthand is a method of writing faster and/or more compactly. Speeds over 200 words per minute are attested, or fitting an entire printed page on a sticky note.
It's an extremely niche interest, so the main thing preventing a comparable community here is enough active users who are interested. I've wanted to do a series of posts teaching one of the systems, but I've not hand the chance.
Fun fact! The farmers rely on this effect to supply supplemental meat in the growing season.