This can not be boiled down to a formula, because there is a huge factor in terms of what do you want to do. DO you want to be a doctor? If not don’t go to medical school, its expensive and a huge amount of work. If you think you could be a good doctor and would like the work think about it.
The most important thing is to try and figure out what you want. Don’t go into a job, no matter how good the money might be that you will hate. You will not do well if you hate your job, it will show and you won’t last long.
You can do well in many things on paper but it really depends on what types of things do you want to spend 40+ hours a week on.
I am in software and love it, but it will not be a good fit for everyone.