Keep going. Most of the jobs I’ve got through cold calling – emailing or ringing up companies and asking if they have vacancies or if they will be looking soon. (Is even better if you go in in person but obviously this isn’t always convenient!) that way people will have your voice/face in mind, this is a particularly good way to get jobs that have not yet been advertised. You never know, someone in the company may hand their notice in the same day you take in your cv!! Stay determined and you will get one!
Good luck :-) x