Hello! Here's my effort from this nice song. The original tracks here were surprisingly dark altogether; I had to add huge amounts of high end to master bus in order to get it into same ballpark with many other commercial 70s (CD remaster) releases. I was using some classic "Yes" as reference.
i actually like the darkness of the track. The modern way of re-mastering everything in your face (and over-compressing/limiting it to death) is nothing I can enjoy. I'm a child of the 60s/70s, and still listen mostly to music from that time.
But, that said, you do have a pretty good mix, no doubt. It just does not sound retro, but that was obviously not your intention.