Multiple attempts have been done to fixing C security issues, but the community at large tends to refuse to adopt them, so the only way forward is to create other languages for the same domain.

Note that Objective-C and C++ are extensions to the C language, and both started as pre-processors that would generate C code.

Also C wasn't the first on its domain, just got lucky that UNIX got widespread adoption and then found its way outside UNIX, just like JavaScript eventually found a way outside the browser.