Hey, great question!
I am not sure though, if it is about the 'job' per se or if we should be discussing soft skills.
If I had the chance to back in time, I would probably choose to learn more about
- economics fundamental
- data science
- coding
- business development
These are skills that are always useful, even at one's own job.
When I was young people were all crazy about website design. Now, nobody speaks about it and you have CMS like wordpress that kind of replace that job. It's pretty difficult to look far enough into time to see how things will evolve :-)
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