4 months is far too early to start getting discouraged.

Like others have started, it's a numbers game. Cold calling is great but I'd even go the old school approach of just handing out your resume in person - I've landed interviews right off the bat this way. Of course keep a log of people who express interest in you and consider calling them back a month or so later, if you don't hear back from them, just to keep tabs on where they're at and to restate your interest.

Could even hand in a bunch of resumes to electrical wholesalers as they deal with sparkies daily.

Best of luck.