I would suggest working in something that will put you close to what you love.
Teaching literature will put you in touch with the greats so you can put food on the table, practice your craft and take a night class here and there.
Journalism would provide life experience, subject matter and help you sharpen your skills. The same qualities of concise description and concrete images and action verbs are required.
If you are interested in greeting cards, there is a technique to what sells. You should study the wording on the Greeting cards, or maybe seek employment at a greeting card company.
The greats in the 20th century had careers to put food on the table. They did not receive money from book sales until middle age or later.
TS Eliot was a banker.
William Carlos Williams sold insurance
Wilfred Owen was a Soldier and died at his profession
Ezra Pound was an editor
Wendell Berry is a farmer
A few are professors or teachers
Gary Snyder bounced around as a logger, forest ranger, ship hand -- whatever would put food on the table while he wrote.
Thomas Merton was a monk
Some apply for grants to finish their books but almost always revert to a paying job.
Very few had poet as their profession but generated great poems.