I think your song is plenty loud already. I was listening to some commercial music before your song, and I had to turn the volume down because your song was actually louder! I would try raising the threshold on your limiter by a few dB to see if that restores some dynamic range. Also, make sure your compressor has sufficient attack (~30 ms) so you don't lose the transients of your drums. If all else fails, you can always go back to the mix and turn down your synths a bit. Or use more sidechain compression to create space for your kick.
