Good Premise
You have something in this song, and if I'm correct, you have some sound libraries from Eastwest now, no? So you'll be able to pull a really powerful piece if you put your back into it.
Now. Into the piece. You have a good premise, it's true, the sound isn't brilliant, but I can hear what you're up for.
First and foremost point I noticed immediately. You need more dynamic contrast. I'm sure you are familiar with the concept of normalisation. Anything sufficiently repeated becomes normal, and uninteresting. You may walk into a new land and stare at all the new exotic things, but stay there a few months, and you'll cease to be amazed. This concept applies everywhere.
Without sufficient contrast, anything will become mundane and boring after a time. Light does not exist without shadow, or the potential for shadow, love without the potential or reality of hate, beauty without ugliness, softness without hardness, kindness without cruelty. Each of those opposites is, in a sense, DEFINED by its counter. If a world had no ugliness, it would have no beauty, as there would be nothing to compare it to. Kindness without cruelty would simply become a normal attitude, and the common themes we attach to it would be meaningless.
The same with this piece. To properly portray sadness, you must contrast it. And I don't mean sudden happy/sad fluctuations. It's a bit more complicated then that.
Consider poignancy. We can say a movie is sad. And we may not necessarily be affected. But if it was a touch of sadness and a touch of happiness; in other words, POIGNANT, it gains a whole new amount of meaning.
Remember what it is that sits behind the word, lament. The definition:
"A song or hymn of mourning composed or performed as a memorial to a dead person."
"A cry of sorrow and grief."
"A mournful poem; a lament for the dead."
Question. Why does someone lament? Because they are mourning the happiness that they have lost. They are contrasting the happiness and the sadness. The grief is brought about because happiness and connection existed at some point. They are lamenting because the whatever was lost meant something to them deeply.
Try to convey this. Convey the sense of happiness or meaning past, and the grief of it lost. Contrast the heavy deep pain (bass vocals, drums, bass strings etc) to the higher, lighter more wistful memories (flutes, higher strings, altos, etc). Carry the thread of memory and loss intertwined, joy and sadness.
Also remember to control the tempo of the piece. Some parts slow, some fast. Create contrast. Powerful, quiet. Ringing agony, sighing memory. Sweeping pain, huddled regret.
Life is our muse. Call upon her observe, consider, construct, deconstruct. Examine in great thought the mysteries behind what it is you want to convey. UNDERSTAND it.
If it doesn't make you feel, then how can you expect us to feel. If you leave it for a week or two, and it strikes you to the core, then it might with us. But remember, you have built a strong emotional attachment because you built it. Listening will invoke that attachment, so you aren't an impartial observer. Ask someone you trust how it affects them.
The power of those pieces of art that are truly poignant and beautifully sad is in their ability to contrast the element that they are portraying. Their ability to summon it in all it's glory and power.
Good luck with your project. I know this isn't really a shred of the song itself, more of a consideration of what should be going on behind the actual production of the song. I hope it's helpful in some way.
Cheers, Krayon.