Send a thank you email, thanking them for their time and consideration. Doesn't have to long or overly verbose, but it puts you back on their radar - they'll either say they're still working on the applications, or they'll politely reject you. But 'thank you' emails tend to go a long way after an interview, as it shows you respect the time of the interviewers, blah blah etc.

Keep trying, and consider any "failed" applications as interview practice. It'll be alright, friend, you got this!