What can I do if my current employee doesn´t renew my contract?

Hi

In context, I have been living in Germany for five years. I studied for a Master´s degree and then applied for a job seeker visa, which I had for six months, but after that, I found a job. In this job, they first gave me a limited contract for one year, and after that, another contract for one year. My boss told me she would not renew my contract a month ago. I know that after 1 year of working in Germany, you can receive the Arbeitslosengelg, but my question is, can I apply for any other visa? For example, to a chancenkarte or to a job seeker visa? By the way, this year I never got my new visa, I just had a Fiktionbeschenigung, and never heard back from the Ausländerbehorde. 

Thanks!