You need to find a way to pay off the $10,000 you still owe for last semester. Since you are already working, consult with the people at your university, and get a payment plan set up that is workable for you. Don’t let it go to collections.
While you are paying down the debt, work with your university to come up with a plan that will allow you to eventually return and attend part time so that you can complete the coursework needed for your degree. And yes, it is entirely possible that they will require that you take a full semester worth of coursework in order to fulfill attendance requirements even though only two courses would be needed to fulfill the specific individual course requirements for your major.
University of Maryland Global Campus, Penn State World Campus, and Excelsior College offer extensive degree completion options. However, you still would need to be able to send the transcript from your current university.