Great advice - i've been making music for over 13 years - and your never going to win every race - i put countless tracks into opps in the past that didn't make the cut - But keep going and keep making the music YOU like and want to make, and eventually you will get to where you want to be - or at least a little further :)
You can't really have a go at the people judging they cant pick every track - But there's always a next time, as long as youre getting better then -Never give up :)