C# and .NET are highly underrated/underappreciated because of some early flops and the Microsoft branding.
It's converging with TypeScript in the best way possible[0] and has some really great language features that even TS is lacking (really powerful switch expressions, for example).
It seems like the natural option for teams that want to move from TypeScript to a compiled, multi-threaded, statically typed language but it seems that there's a lot of teams that would rather use Go or Rust; neither of which are as easy to step up to from TypeScript, IMO.
I think if Microsoft were to make a T# -- which removes some of the legacy cruft from C# -- it would blow minds.