I've been a C programmer for several years now (out of necessity - C is still the best language for firmware and embedded development)
There's been a lot of noise on the internet about Rust and C++20 and "modern" languages. I recently had an opportunity to try some of these first hand.
Honestly the new language features are all terrible with few exceptions. In general, anything that was added to a language to support generics or to hide pointers and memory management from the developers on a language that isn't a lisp has only produced more harm than good.
I grew up as a programmer always thinking about the underlying CPU and the underlying memory and how my code would interact with both of them. It requires greater care as a programmer and tools like static analysers, code reviews and rigorous testing are extremely important. Improving these tools and coming up with new ones is far more useful (in my opinion) than trying to update C.
Yes C has it's flaws. Sometimes, those flaws are important and a replacement language is useful. I find that Go is a very interesting replacement for C at sufficiently higher up the stack. Something like Haskell probably will best fill in the gaps between C and Go.
I'm not convinced that fixing C with something like C++ was a good idea. Similarly, anything that's trying to fix C++'s problems is unlikely to come up with a decent way to have generics and hide memory and pointers from developers.
If I was going to create my own language, I'd keep it like C, remove some of the undefined behaviors, add support for Posits, 128 bit and arbitrarily wide signed and unsigned integers, features for explicit cache management (!!!), container classes as part of a standard library, Go-lang style interfaces and bake in something like cppcheck into the compiler.
/rant