Need Tips!

[sacred cove]

What should I do to improve the colors?

I was looking to this:
But my blue is much brighter

[frigid kite]

Completely reprocess it. That's unrecoverable.

[frigid kite]

For future processes, try to not touch the saturation too much. It seems heavily oversaturated. Instead. simply combine the channels and apply a color calibration. You should get pretty close to the reference images you shared below

[sacred cove]

actually, only in the ending a did +4% saturation, this was just using color calibration

[frigid kite]

That's hard to believe for me lol