At the commencement of the semester, there remains a possibility of additional vacancies emerging after the initial days of classes. Therefore, it is crucial to regularly monitor the campus management system for any updates. If, however, such vacancies do not materialize, an alternative approach would be to reach out to the seminar professor directly. In doing so, inquire whether they may consider accommodating you, particularly if you possess a specific need for the course, such as for research purposes, etc. However, bear in mind that it is not always possible to secure enrollment due to class size limitations.