Which skill should I learn as a backup if I can't clear competitive exam?

I've been preparing for competitive exams for the last 3 years. As a girl from a middle-class family there's a lot of pressure.

I want to learn a skill that I can freelance with and earn on the side while continuing my preparation. I was thinking about video editing but it feels quite saturated now.

If you were starting from scratch today which freelancing skill would you learn? Looking for something with good demand that I can start earning from within a few months.