This song is so powerful and evocative! I can feel the beauty and inspiration turn into frustration, anger and alternating breaks of resignation, but also determination and hope.
The main motive is first heard at 00:15 with a positive sounding instrument, and followed by an overall upbeat phrase, like an ephemeral spark of inspiration which dies very soon, thus setting the stage for the endeavour that comes after.
This really sums up the creative struggle of expressing oneself without watering down the underlying ideas/feelings for the sake of pragmatism (and getting stuck as a consequence). I find it ironic that the actual inspiration came from the struggle itself (kind meta XD)
That open finale was a delightful surprise and definitely my favorite part. It painted the image of a composer endlessly playing the same notes hoping to come up with the next part.
Fading from that energetic refrain subverted expecations and left a sour taste, expressing that bitter, nameless melancholy that comes after anger and other powerful feelings.
Maybe I read too much into it, but I did my best to express the ideas your song sparked in me.
Have a nice day!