I don't think you are wasting your time, it shows that you are serious about the company. I would continue to educate myself on what it takes to get hired (not quals) and use an interview prep service like Clark Consulting, and definitely attend the Job fairs until you get hired. (I know all this cost a lot of money but this is your career).

Sometimes the system weeds out good people so put yourself back in the mix and make yourself stand out more every time by being better prepared.

In our group there were guys who were a lot more qualified than myself who did not get hired and they truly wanted the job.... The advice other Frontier pilots gave them...... Re apply.

Good luck.