Tips for Preparing a Mix for Mastering
You've done it! You successfully recorded and mixed a track.
Take the time to appreciate this as a success, because it is, but you haven't reached the finish line yet. Now is the time to master your track.
Mastering is such an important part of music production as a whole, yet it can be very misunderstood. Mastering will bring all of the little ear candy pieces and nuances you placed in your track to life.
This being said, there are a few things you need to make sure are taken care of to prepare your song for mastering.
source https://www.aimm.edu/blog/how-to-prepare-a-track-for-mastering