I would agree, lowering individual tracks can be the ticket, but, just sometimes, the flare in which they all come together at the stereo buss [the sparks coming out of the whole summation] can be the tone and colour, I want.. then lowering the faders can change and has changed the tonality of the whole mix on some occasions. [the vibrancy, the smack, the gravel edge of the mix etc..]
I learn't early, that staging the mix and concentrating on its headroom throughout the process and bringing all other attributes to stay on the chosen trajectory [where I like the tone etc], was paramount from the starting point of the mix itself.
Experience goes a long way, while mixing.. The more you do it, the more layers become visible and the matrix of mixing gets clearer and the possibilities understood.
Remember, there is no method or a particular way to mix, it’s the desired sound being chased. Of course there are norms to seek the same, as discussed here.
Keep at it.
Cheers..
KAyo