What can I do to earn money if I do not want a career that requires long investment to build up?

I know some IT programs can be completed in 2 years and that you could acquire a lot of the skills outside an academic setting - that sounds far better than my previous dream of being a professor which could involve 20 years of schooling or more. I also want to be a psychologist but even 6 years of schooling sounds too long for me.
What can I do to earn money if I do not want a career that requires long investment to build up?
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