My vote is on Nim. Python like syntax with C++ speed. Unknown enough, but still not too new or obscure.
If anyone cares, here's some comments from one of those authors: https://github.com/StefanSalewski/NimProgrammingBook/issues/... . And from the other: https://twitter.com/d0m96/status/1592827547582332929?t=IqKBz... .
These quarrels with Araq differ obviously, but both are pretty discouraging as far as Nim's prospects are concerned.
https://github.com/nim-lang/Nim/issues/9026
Nothing as strong as the above but it definitely rubbed me the wrong way. So much advertising about Nim being efficient/fast and the default way to read a file is incredibly slow and inefficient .... and they don't care.