I am an international student, what can I do to get an admission to a master degree program without numerus clausus as early as possible so I can apply for a visa?
You should apply early for the master degree program without numerus clausus with complete documents, in order to receive an admission notification from the beginning of August.
If you apply late for a program without numerus clausus (deadline August 15), you might not have enough time to get the visa before the semester starts.