You take writing in a very narrow meaning.
WRITER is nothing. AUTHOR is all.
You can earn a living as an AUTHOR.
Today if you want to succeed in your “writing” career, in other words be an author, you have to be multi-genre, multi-media, and “write” for different platforms, like cinema, theater, opera, songs, essays, eventually literature and research, and even maybe more of these paying writing jobs, and all of them are part of ONE job AUTHOR.
You might not earn a living with one but you can earn a living with several, and add journalist, columnist, textbook author, and so many other possibilities on radios, TVs, nowadays counting in thousands on the Internet.