I just use a couple really simple ones! I'm sure there are a lot more good ones, but I havent seen the need for them.

• braver's typewriter - centers the document and word wraps by default, which makes it a lot nicer on the eyes and better simulates actual paper (minus the pages) imo

• word count - theres a few, I'm guessing they're all basically the same.

• gitlab package - pretty unnecessary LOL, but I use gitlab as an additional backup source since they have private repos. Definitely not its intended purpose, but works for me

I tried a Hemingway package at some point, which prevents editing to some extent so you can focus on writing(?), but I decided I worked better without it.

Have you tried any?