I know from personal experience that perseverance is the best attribute. I have been shortlisted twice for different TOC's and I have applied for probably 5 in total.
I could have applied for more, but I have chosen to be selective.
This is because in my experience, the good companies shine through while the bad ones demonstrate their reputation regularly.
For those that are yet to receive a letter or email, it is highly unlikely that they would all come at the same time, most recruitment phases are implemented in a staggered manner simply because of staffing issues. There are only so many instructors and HR officers available after all.
In the end, keep at it. review your applications, save them so you can look back. Use what feedback you get to modify your next application, because the difference can simply be in the wording used.
It is also almost akin to a lottery and a numbers game, so even a good application will simply not be selected.
"If you gave up, you didn't deserve to succeed in the first place"!