I read that Go was created to replace C++ for some use cases, but it never really appealed to C++ programmers at large, likely because unlike C++ it is quite a 'dumb' and inflexible language.
Instead it appealed to Python programmers, who got a decent type system, still a relatively simple language, and much better performance.
Also see this classic blog post. https://cowlark.com/2009-11-15-go/