If you get an interview, that means you're doing something right when it comes to your previous experience and general written skills. However, if you don't usually make it past the interview part, that means that the interviewer probably thinks you don't sound confident and/or prepared enough. But there is always room for improvement. Sharpen your interview skills; there are many helpful videos on YouTube that go through the questions employers ask during interviews and will show you how to answer them in a politically correct and sociable sounding way. Watching YouTube videos and practising scenarios in my head has personally worked wonders for me. I hope this helps and good luck!