Hi Jules, (from just up the road a bit)
I have some thoughts that may or may not apply to you, but they will apply to some readers so I will voice them here in a general way.
One of the earliest obstacles we face in media music is getting out of our own way. I find it difficult to think of music as good or bad. That's the leisurely privilege of the casual listener. There is only (1) works or (2) doesn't work for a specific opportunity.
Early in the journey we are attached to our music in a very personal way and we take feedback very personally even though the feedback is usually coming from the perspective of a specific context.
Two perspectives at odds with each other -
1) this music is part of my soul and criticism of it is criticism of me
2) this music doesn't work for this opportunity for this reason
I can submit trailer cues to listings for instrumental underscore, jazz, adult contemporary, top 40 pop, etc and know without a shadow of doubt that they will get returned each and every submission. But I also know that it will be no reflection on my writing and production abilities. It will be because I have not targeted the music to the pitch.
If you (general) want to play in the pool for media music you have to learn to detach from the music and align your thinking with perspective 2. If this music doesn't work for this opp, what can I change now, or do differently next time so the music is more focused for similar pitches? That's where peer-to-peer is invaluable (IMO even more so than the screener feedback which is limited). You can enter into conversation on P2P and engage in feedback that spirals inwards towards the target. Part of the targeting process is also learning about what you don't know that you don't know. We have to wear a lot of hats. Not only do we have to write on-target, but we have to be able to mix genre appropriately, produce genre appropriately, master genre appropriately.
I don't say this shift is easy or happens quickly, but getting there is the only way to stay sane and happy along the journey.
Some people can't make the transition in perspective. And that's ok. If they want to keep making music that makes them happy, that's fine.
But in shifting to an opportunity focused perspective, you learn to be able to create art within a context anyway and without taking the criticism personally. This path *can* be personally fulfilling and commercially usable.
It doesn't and probably can't happen overnight. It's a journey but if one commits to the process of learning to write and produce within the framework of the opportunity, then there will be progress.
who have been performing for decades. So I have been submitting my back catalog , as I am writing new songs as well. 
