What is the best methodology to select a major? (Diploma and academic courses) Alright this question needs a little more context. This is not about me but I will define the situation as if it were for myself, so feel free to ask me directly for clarifications.

I'm a German student currently in my second year of a university course that combines both teaching (to children) and art. The problem is with the actual practice during internships: I quickly realized that teaching is not for me; plus, art doesn't guarantee me stable outcomes at all, the jobs are very rare and underpaid.
So now I'm fully decided to change my course,I've already started searching by:


Looking up the available diplomas in different universities in my country, and the contents of the classes they are made of. This didn't give me the inspiration I expected, and didn't give me a relevant sense of what was really taught.
Going through various online orientation tests, but their questions are not precise or numerous enough to give me relevant tracks; most of them lead me up to the legal field, which I highly dislike.
Going through various lists of jobs, also to get inspiration and know about stuff I didn't know. But it still does not give me a solid overview of what the  careers actually entail.
Talking with as many people as I can about it, to share experience and knowledge.


But all this brought me no closer to my goal as I'm still stuck at the same point. So my exact question is: what would be the best tools/ways/methods to find and analyze relevant programs that I could enjoy, as well as their outcomes ?

P.S.: I didn't find any other relevant SE community in which I could ask this; if there are, I would be happy to move my post.
You first must determine your values, as ultimately any answer you'd find convincing must satisfy your values. Then, the problem becomes more a question of how to best satisfy these values.

Decision making skills can be useful in choosing a major, and will be useful for almost any choice you make. I'd recommend taking a decision analysis class, as I did during my PhD. The principles involved with making good decisions will be valuable in almost any endeavor.

If you want to improve the world in a very utilitarian way, the website 80,000 Hours should prove useful. The organization is affiliated with the University of Oxford and focuses on helping young people make valuable and satisfying career choices. Of course, education is a major part of this. They have a career guide that I've read a large fraction of, along with a decision tool.