Thanks for the above, but I should comment upon your suggestions from my own prespective:
I am not very much of a compressor/masterer/synth person, and most of what I'm hearing from that angle seems to work for me.
Mastered according to sound achieved on 4 different systems and I spent about half of the total time on mastering itself, so I
guess I did a pretty good job here.
Anyway, to the main part:
firstly, the empty section at 2:32-38 is way too long in my opinion. Afterwards, it sounds like the entire song is restarting, or that a new song started playing. I might suggest adding ome synth or mild percussion there to fill the gap, or to just make it shorter. Or maybe just cut the entire beginning section, since the song is 9 freaking minutes long! Your call, but it's not that it's badly done, it just confuses the listener as to where you're going while the rest of the song is rather stable.
I was aiming for a longer gap - not the longest, not the shortest. It's the time during which the reversed crash is fading out, giving the listener the time to mentally prepare for the build-up. I was thinking of adding a vocal slice from the starting vox line and also slowly fade it out ("know" part), and the more I think of it that might not be such a bad idea.
Over the entire 9-minute piece, I couldn't help but see how repetitive the entire thing is. If making it that long isn't enough, a lot of the sections seem copy-pasted, if you get my drift. This is my main issue with the track.
As for the length - progressive trance. They tend to be long, and somewhat repetitive. The uniqueness is in the transitions, automations and modulations and not, as you said it yourself: "f***ton more synth" (totally agreed, btw.)

I believe you're not a fan of this kind of genre, but I might suggest you to listen to a few. On a side note: I am not a professional myself.
6:00-32 is definitely your strongest section. 6:54-7:00 and 3:09-17, are also a better moments. This is because you make these two sections unique with the instruments you add/subtract. A bunch of things can make sections sound different within a piece. Ending with 1-2 beats of silence can strengthen entrances afterwards just like a buildup, and in the same way, taking out the percussion can make a section just as tense as adding a f***ton more synth.
Totally agreed. I really do love what I did in the break between main parts. I am going to work on it a little bit more - I want to get a unique hihat sound and pattern.
Furthermore, I did use a variety of "silences" between various sections - with none of them repeating itself. They are all unique in that respect (they either have a different kick/hats pattern or both.)
The synth you add at 8:06 seems underused. I can hear that only at the ending, but it has a strong presence and it brings a bit more excitement to the track. perhaps you could start by moving that about to some earlier parts of the song?
I believe that what you hear there is the modified pad line that indeed has been used before (during the "break") - I just wanted more variety and to not repeat the entire thing from the middle of the track. It actually uses the same vst like the pad you could hear before that last section began.
Besides such, changing lines around can also help vary the focus and make a track more interesting. 1. Maybe the vocal melody can be given to a synth for a section? maybe you could give other syths the bassline and have the bass play a melodic part? 2. maybe just give a different rhythm for the same chords? 3. Or maybe be so bold as to change the tempo for a section or two? There's tons of edits you could make to each section that would make them unique, giving the piece more interest and less repetition. That's my suggestion.
1. No, no, no. That's exactly the opposite of what I was trying to achieve with this remix - unique sound with as few references to the original as possible. There are way too many of those out there.
2. Not sure if that would be such a good idea. If I wanted to change anything with those, I would have to rework the other bassline to not interfere with it.
3. It wouldn't be bold - it would be unreasonable to change the tempo of a fast-paced progressive track. Please don't take offence here - I just don't like tempo changes in electronic tracks.
Don't take my advice too seriously. I'm nowhere close to pro level, and I may be entirely wrong, but that's my opinion. take it or leave it.
Now I'm not sure how to take your advice given your last, rather unfriendly sentence.