I feel like the fastest growing and most dominant area for C++ is scientific computing and AI/ML. Although many people write these programs in more user-friendly languages like Python and R, most of these programs call through to C++ frameworks (which many people use directly too), so in a way C++ has latched itself to the growth of such languages. Furthermore many major accelerated computing platforms (frameworks?) such as CUDA, Intel's oneAPI and Khronos' SYCL are focused on and committed to the C++ language and ecosystem and I don't really see much competition in this space for the time being.