Nim is an impressive undertaking, though I was sheepishly overwhelmed when I tried using it for a quick project and realized I might have to spend 30 more minutes reading the docs than writing cowboy code. It's quite a big language: https://nim-lang.org/docs/manual.html
I can recommend a look at Crystal also, although Crystal is not even 1.0
Between the two I found I needed much less referencing with Crystal, and when I did, I found it more intuitive, well described and easier to remember and apply the same concepts in other places.
Would love to take a more serious look later.