2. Apply only for such jobs which are qualified for:
Yes, applying for a job randomly without being specific of the job you are specialized or qualified in, can put you nowhere in the job market. This can turn out to be the biggest mistake you can do, by sending out your resume to all the job openings in the job market without preparing yourself in any particular field of work. It can be a big waste of time, if you fail in receiving any job opening calls from the companies.
So, as you would be already qualified in a particular field of study, apply only for jobs related to that sector, even if that particular job is not in that much demand in the job market. Who knows, you might end up with a good job in future in your field of study.