Zig looks perfect so far, but it's too early to switch over yet.
Any other promising candidates?
Or D itself if you don't need a language as minimal as C. D is basically C++ redesigned and now that GCC includes D support by default I wonder whether it'll gain popularity.
PS: my main use of C is currently to write platform abstraction libraries with minimal size and runtime overhead, so need to talk directly to operating system APIs, plus WASM is a very important target. The libraries must be usable from other languages via automatic bindings generation (quite simple with a C API). Also for performance-oriented stuff, direct control over memory layout and lifetimes please.
Also personal opinion from 20 years of C++ experience: high level abstractions never pay off in the long run. Simple imperative code always wins when it comes to "malleability".
Even just requiring users to integrate my hypophetical Ada library source distribution into their project's build system files would most likely drown me in support tickets ;)