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Like Jessica said, it certainly sounds like you have impressive things to write about! Perhaps it's about reframing your experiences - partly in regards to how you present them in an application, but, without sounding incredibly cheesy, it sounds like it might help if you tried to reframe your own feelings towards your applications? If you don't think that you're good enough, this is likely to seep through into your application - it becomes a self-fulfilling prophecy to some extent. And even if you get through the application stage, think about how your mentality may impact you at interview, if you think that you aren't as good as other candidates. This isn't to criticise at all, I'm sort of in a similar position at the moment, but I'm trying to tell myself all of these things! After so much rejection, it's so easy to feel like you're not a great candidate, but the fact that you keep applying shows how dedicated you are, and that dedication isn't to be undervalued. Plus, it may not feel like it, but with each cycle, you're probably getting better and you're getting closer. Celebrate the small things and look at your progress!On a more practical note, over 20-30 applications sounds like quite a lot - perhaps you need to reduce the number you do and spend more time on each one?
Like Jessica said, it certainly sounds like you have impressive things to write about! Perhaps it's about reframing your experiences - partly in regards to how you present them in an application, but, without sounding incredibly cheesy, it sounds like it might help if you tried to reframe your own feelings towards your applications? If you don't think that you're good enough, this is likely to seep through into your application - it becomes a self-fulfilling prophecy to some extent. And even if you get through the application stage, think about how your mentality may impact you at interview, if you think that you aren't as good as other candidates. This isn't to criticise at all, I'm sort of in a similar position at the moment, but I'm trying to tell myself all of these things! After so much rejection, it's so easy to feel like you're not a great candidate, but the fact that you keep applying shows how dedicated you are, and that dedication isn't to be undervalued. Plus, it may not feel like it, but with each cycle, you're probably getting better and you're getting closer. Celebrate the small things and look at your progress!
On a more practical note, over 20-30 applications sounds like quite a lot - perhaps you need to reduce the number you do and spend more time on each one?