for me C is fall to another league.
C its not language for IT people, it language for electronic engineer.

u need to understand register, cpu architecture, byte and bits if want to deal with C.

and 1 more things, salary for C programmer its not cheap

Try this:
https://www.acepace.net/integerQuiz/

I didn't even get half correct.

Many legacy systems were written in C and C++. It's not an easy language to pick up for sure unlike some of the newer languages. But if you need high performance and low latecy software, it's the only way to go (imo). For instance, if you want to optimise your product and want a lower level of control say want to experiment with the different types of locks, atomics instead of locks, own memory allocator, then C/C++ is the way to go.

Still relevant for embedded system programming, drivers, start up code

Now C / C++ can be used to compiled to WebAssembly through the use of Emscripten compiler / emsdk

Old or maybe ancient code can be ported to run on Web Browsers, so C has very longevity left and can stay relevant for a long time