I think this is one of those things that's way easier if you start early. Not sure if schools still have typing classes now. I vaguely remember mine in the 90s, but I didn't really get fast until I started playing MUDs and typing was a matter of life and death!

Now that I think of it, they were also really helpful for learning how to scan a wall of console text and look for the useful bits, and also realizing the value of configuring shortcuts and syntax highlighting. I see someone already had the idea of using a text adventure to learn Bash: https://gitlab.com/slackermedia/bashcrawl