by understanding the entirety of the concepts of the tools that are at your disposal.
If you want a more applicable answer....
You have to do enough research and log enough time with the individual components of your DAW as well as the basic functionality of your DAW.
Reading the DAW manual helps greatly, reading other DAW manuals might help inspire some ideas with the DAW you currently use.
quite honestly, i am doing less things more effeciently.
I can get quite a bit out of one sound source because i know what i am using and how i want it to work with in the given sound source. and when i get closer to finishing, i drastically reduce the load i have to do in mixing, because i've done all the prep work before hand with my sound sources.
the closer you get to finalizing your track, you should be turning down your volume on the interface, and not have to be doing so much. to a point where, you just sit there and groove with it. or you could just hate listening to it, even after a week break (that's when you should just scrap it for parts)
that's when i know i am ready for mastering or the scrap yard.
TL;DR
Make sure you're processing a solid input signal, and you should be doing less work as time goes on as you go towards finalizing or scrapping the mix/song