Proper use of the language is what https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines is for. Before that, there were HICPP, JSF, MISRA, ISO/IEC TR 24772, NUREG 6463 etc.

I have been writing in C++ for most of my professional career, I wrote company-wide guidelines, I still teach and consult. I absolutely agree that C++ is not going anywhere anytime soon. That being said, so is smoking. We can't just tell people not to smoke anymore, we live in a free society. But we really shouldn't drag more people in.