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I think one thing which makes a track go stale for me when I making it is if I listen to it too much, and if I take too long to add more things. if I have a couple of listens to get the vibe I then have to say to myself "ok now add the next part!" otherwise I'll stall. When I've stalled I find it hard to make changes because all the changes I make don't fit...

Another thing which helps me when writing tracks (I'm not writing bangers really though) is to write the melody, the chords and the drums first, then do the bass. i totally set up the vibe of the track, which has to be good, then when you add the bass line (which hopefully virtually writes itself because of all the other stuff) it just makes it even better...

you need to vary up your main melodies, drums, anything really. Every single one of your tracks in your tune "Postman" for example, is just looped continuously until it is taken out of the tune. Try listening to artists like reso to work out how he uses fills to keep his tracks sound like they are progressing all the time and to stay really interesting all the way though for the listener. Its all about how you handle the last 4 bars in a set of 16 imo

simple little background stabs and noises can keep a track running and slight variations in your patterns be it drum, synth etc
you can even keep same patterns and do something like a panning variation or reverb soak etc
get creative, it's just a matter of tricking your ears into thinking it's not a loop based piece