Hi! First of all: thanks for submitting. Not sure what aesthetic you are going for, so everything is subjective.
I would think, that a kind of "bombastic" sound would fit this style of music. In that sense the sound is pretty "narrow" in terms of the stereo image and the frequency (and on the other hand to little compression). If you are going for a more "handmade" sound, there are still some things I would change:
1. stereo image: pretty much everything is in the center (perhaps double the guitars and pan them left/right, drums seem also very narrow: spread the toms out and so on) // if you're going to layer the vocals, spread them out a bit)
2. low end: try to get a fuller low end (compression on the bass guitar, look out that bass drum and bass are not turn into mush)
3. overall compression: especially on the drums, they are a bit inconsistent and tend to get lost on the fills for example

Thank you very much for the answer!!! The guitars are separated along the panorama by 40 to the right and left. I don't understand why it sounds so flat.😔

Привет, хороший музон, атмосферный, слушать приятно. Мне кажется, главное, что не хватает low end - и бас и kick слишком уж безобидные. Возьми прямо какой-нибудь похожий профессионально смиксованный трек и по эквалайзеру выровняй бас, чтобы такой же громкости был как там. Остальное уже перемиксуй по громкости относительно него. Мне обычно это очень помогает.

Спасибо!!

Everything that Matthias has already mentioned + echo/reverbs: Your Instruments need some room information. Even if you want a quite dry sounding mix, you should always at least use some subtle reverbs.
I like to use buses with at least 3-4 different reverb and echo effects and then I send each track to all of the reverbs but at different volumes. This creates a very natural layers of depth.

Спасибо!!

I hope Dan Warrall is not reading this (😉), but try something more extreme with the stereo image (especially when your mixing on headphones, that kann really screw you preception). In rock (our metal) it is quiet common to pan doubled guitars hard right/left, meaning one 100% to the left, one 100% to the right (if they play exactly the same and maybe have a slightly different sound. It obviously doesn't work if it's the same take with the same sound: that's mono!).
I don't know if this is true but my subjective perception is that we experience panned sound sources more exponentionally (or even precise logharythmically). That is, as long as you are pretty much in the center (say under 50%) changes in panning will have a small perceived effect, but if you come closer to the extremes changes will be much more obvious.

What you describe as "flat" is due to too little compression and a weak low end, in my opinion.

Спасибо, это очень хороший совет!!