There is a lot of advice out there for amateurs and for those aspiring to be professionals. It does seem to be true that when the successful are polled although they did all have to write well and make the right connections the ways that people connected the dots, so to speak, is not the same. It seems the individuality does have a real influence on the best methods for how someone can find their own greatest success.
For those really just looking for a steady job there are ways to do that as a writer but the whole approach and ambiance may be different from that of ‘the writer as artist’ or ‘big, huge star author’. The most published writers are often the journalists, advertising writers. The other mos published do so as part of their daily jobs that may make some writers uneasy. As previously mentioned: grant proposal writers and people working corporate documentation.
Other prestigious positions as writers, are the academic realm and in the arts.
Nonfiction books often sell more easily than fiction although passionate readers of fiction may find that hard to believe.