D sits in a weird place and that's probably why it's not widely adopted.

If I'm using C, it's probably because I'm doing something low level and garbage collector could be problematic there. If you are fine with complexity, C++ or Rust are better options. If you want a simple language, I'd suggest Zig.

On the other hand, if I don't want to deal with memory management, and still want fairly fast compiled language, I'd just go with Go. It has a much better ecosystem, because low level GC language is really mostly targeted at server components and Go excels there with implicit async everywhere.