Before retiring, I made a living writing for newspapers...covered local meetings, had a garden column for awhile, did special articles on agriculture, quarrying, logging mostly for regional publications. I also edited a horticultural regional (northeast) publication for awhile. In this line, the way to make a living is to write about things that you can use more than once. for instance, an article on a local farm in a local (county) paper, can then be used in a regional agricultural paper (several states). Sometimes, I could get an article in three different publications, all with their knowledge that it was being done, and with their consent since their readership wasn't overlapping very much.
I hustled, kept track of publications that would announce (either an article or an ad) upcoming seminars, meetings on specific subjects, or that would be promoted through local clubs/associations dealing with their specialty.
It was an interesting 25 years where I got to meet people, mainly those who were in the fields that were of personal interest to me. I also got to do some traveling to cover national conventions for one outlet meeting nationally knowledgeable people in my favored topic.
Prior to the 25 years, I worked other jobs also...nothing to do with writing, just things to make money until I got established with the publications that I wrote for consistently.
I haven't tried fiction, but have considered it. Not very seriously, however. I do proofread for a friend who does e-books. Just for the pleasure of reading her works...not any money involved.