As someone whose first “real” programming language was C, I recommend against writing anything new in C.
There are plenty of C projects you could consider contributing to as a way to learn the language (and if you want a long and prosperous career, knowing C can only help you) but language design has come a long way since the 70s and something like Golang or Zig or Rust would get you many of the advantages of C with many fewer pitfalls.
As someone whose first “real” programming language was C, I recommend against writing anything new in C.
There are plenty of C projects you could consider contributing to as a way to learn the language (and if you want a long and prosperous career, knowing C can only help you) but language design has come a long way since the 70s and something like Golang or Zig or Rust would get you many of the advantages of C with many fewer pitfalls.