Hi.
If you go to forces.ca they show which trades are accepting applications and which trades are in high demand. Watch the videos and read the bios for each of these trades until you have narrowed it down to 3 or 4 then go speak to a recruiter. Sit down with them and discuss these options and reapply. Follow up is key, recruiters see alot of faces on a daily basis so if you don't follow up you may not hear back. Staying in touch with them also shows a level of drive and commitment they are looking for.
Good luck on your application!