It is no longer as important as before that the department you study and the job you do are the same. This is also the case in the country I live in, and the field you develop yourself in is more important than having a diploma.

It doesn't matter which department you study, you can develop yourself in another field. The vast majority of the people I know do not do a job related to the departments they graduated from. Sometimes their living conditions lead them to different jobs and sometimes they choose different fields. If you cannot find a job related to the department you are studying or if you do not want to do it, do not condition yourself and do not give up striving to do the job you want.

Sometimes after choosing a department, you can change your decision while studying the department and give up doing the profession you want. So our decisions can sometimes change. If what we want to do is something different from our department, we should know that we can always do it. In today's professions, diploma is not as important as it used to be. Doing a job is more important than having a diploma for that job. This also applies to the private sector or your own business. A diploma is usually required to work in the public sector.