Hi, Forgeaudio. Thanks for uploading this, it's a piece of music that I really like, so I'm happy to comment on it. My first impression is that there is a very unnatural treatment of the components of the mix, particularly the vocal. It's as if there is a slight robotic edge to every instrument, without any impression of the music happening in a sympathetic recording space. There is no reverb to speak of, nothing to lend the vocal any context or smoothness. I don't think there is any problem whatsoever in the performance of this piece, it's entirely about the treatment of the recorded performances in the mix. When the mix gets busy, the vocal is overwhelmed because the other instruments are trying to occupy the same frequency range as the singer. Pull back the synth pads in the chorus and give the mix some air with reverb.