I really want to change careers, but my parents are not very supportive. How can I convince them?

In fact, my situation is the opposite of yours, but in my opinion, you and I should solve the problem in the same way. Your situation is that you want to change your major, but your parents are not very supportive. Your experience is just the opposite. I don't want to change my major, but my parents don't support me to stick to my major and want me to change my major. Although these two problems are very different, in my opinion, the solutions are similar.

First of all, we should consider whether it is feasible for parents to say whether to change majors. We should think carefully at this time, because it is directly related to our employment after graduation from college. After consideration, if you still insist on your own ideas and don't adopt their opinions, you should clearly express your unacceptable opinions to them, of course, in a calm attitude, and keep this attitude from beginning to end, otherwise the problem will not be solved, but will escalate and even affect our relationship. This is an attitude problem and a macro solution that runs through the whole thing. Here are some specific practices.

You should try to prove that the major you want to study is the right choice. You can prove that your chosen major is correct by collecting information or analyzing your school history and employment trends. These are some convincing methods, because they value the employment trend, and only when the employment trend is good will they support us. Secondly, you can show your interest in the major you want to study and try to express it, which also proves your efforts and achievements in this field. If you do well in this respect, I believe your parents will support you.

I think this will solve the problem.