I'm someone who thinks there is room for lots of good languages, and each has its role, so I don't think languages should be pitted against one another necessarily.
However, with Nim you have something very similar to Python in its expressivity, but with performance comparable to things like Rust and C++. The metaprogramming is very well done as far as I've seen, and it seems very well thought out. It also has solid, useful compilation targets.
It just seems like the whole package for a lot of use cases and I'm not sure why it's not getting a lot more attention.