This other reason can easily be employment. You just need to find an employer who needs your unique skills, and who is willing to wait for you to start until the work permit application is processed.
You do not have to wait for your graduation before you take the first step. You can already start looking for a job while you are studying, and you can hand in your work permit application before your study permit expires.
If you are working beside studying, you can ask your employer whether they are interested in employing you once you graduate. They might say no, since working with students offer various benefits compared to full-time employees. Moreover, if you are employed through a student organization, there will necessarily be a hiatus in your work between the time you graduate (and lose your student status) and the time you get your work permit, and that is not something every employer can afford.
When looking for an employer, clear communication is essential. You and your employer should understand that even if you sign a labor contract, and even though you are already here, you will be able to start working only once your work permit is granted. The application procedure officially takes 70 days, but there might be delays. Because of this, it is important to submit your work permit application as soon as possible.