Hi there.
Other reviewers have hit upon some good points mainly, about production, but for me, fundamentally it didn't really hit the tone of loss or grief. Of course music is subjective and what hits one person in the gut might not another, but hopefully I can offer you a useful critique none-the-less
It started off nicely with that cello introduction gently leading you into the piece, but I felt after that it lost its way. It goes through some stoic progressions, and I certainly get a defiant vibe from the whole piece, but it feels far too often like it rambles without really saying anything. Other reviewers have described the track as 'cinematic' and I'd agree insofar as that I could see this working as the sketch of a track at the end of a Hollywood movie, and that the chord progressions are prototypical modern day action/drama, but I don't feel like the music ever latches onto me, tugs on my heartstrings or pulls me into a narrative, and ultimately that's really what cinematic music is about.
To make the broad heroic statements more effective, I think you needed some gentler stuff to contrast them, and the broader statements could've been more full. Once the introduction is completed, the music goes on in the same key, the same defiant tone, the same volume level, and broadly the same instrumentation. It's almost like the music is a constant climax, and that can be wearying to listen to. Some variation in tone and instrumentation would've helped.
For example, the contrabass is ever-present in the track and I think that makes it a lot less effective and a lot more tiring to listen to. Having even a small section where you drop the bass frequencies can really help. After-all, how can it make much impact if it's just sitting there the whole time? Think of the music that sends chills down your spine, often it's the moments where there's a change that give you that moment, that don't let you get too comfortable, that tug on your heart. For example at 3:11, the track is *crying* out for a change of pace, or instrumentation or tone and it continues in the same vain, essentially restating what was said in the previous couple of phrases. Sometimes you have a to be a bit analytical with your music, as you would an essay and ask 'does this really need to be said? Am I making a relevant point here?'.
As cliché as it may sound, I really think a dash of woodwinds could've brought out some of the emotions you describe in the author comments. There is no also no real clear melody in this piece, and while that's certainly not a requirement for a composition to be good, it can definitely help when you're going for melancholia. It can also help anchor your composition and stop you getting aimless, and simply writing 'stuff' because you have that reference point to return to, and manipulate.
Production-wise, others have written plenty and you said yourself you're only getting started with the software. Needless to say you want your strings to sound less cluttered, and flow together nicer, you could try increasing the attack a bit, a small does of EQ to bring out the better frequencies.
With as critical as I sound, it's not a bad piece of music and I hope my comments are taken in the spirit of self-improvement. Good luck with future work!