I've actually had good experiences with cold calling. Several years ago, I was unemployed. and did submit applications with online job recruiting networks I do recommend doing it, but I also began researching schools in my area (I teach music and art), and sent out applications to schools that looked good to me even if they didn't seem to be hiring. I even popped into a school, as I was driving by, and introduced myself. My cover letters were always tailored to the specific school, by quoting a sentence or paragraph from their website that described their philosophy and telling them how wonderful it is to have found a school with the same philosophy as mine and what a good fit we would be for each other. This is how I got the job I wanted!
It's also a good idea to send a thank you letter, after each interview. I got a job once, solely because I did this.
Best of luck to you, and I hope you find your dream job soon!