How about something creative?
Do you write? Poetry? Songs? Compositions?
Can you teach?
Maybe putting out instructional material on something you do well, a talent perhaps.
Now more than ever publishing (digital publishing) is very viable and quite easy.
The important thing is to do something that can have residuals and can be assembled as part of a resume/portfolio or legacy.
Another way is reverse engineering ~ if you can't earn it, don't spend it.
Assess your expenditures and shoot for simplifying your life.
One of the key talents a wife ought to hone is making fit what the husband makes ~ To be frugal, and to value every dollar brought home from a hard days work.
Not, creating a lifestyle, then finding a way to pay for it.
After all, our Blessed Mother made things work in their household, and they had a simple and happy home.