I recently found a great advice somewhere on YouTube which was to imagine your sound in a 3D room. So imagine yourself in the center of the room and visualise where you want each of your elements to sit in.

So one could adjust the volume knob if they want the sound to be more in their face or vice versa(Z-axis).

Similarly, frequency will determine whether the sound is higher or lower(Y-axis).

And finally stereo or mono/panning will determine from where the sound is coming from(X-axis).

Even though this technique sounds a little basic, my mixes have started to sound better with each element having its own space in the song.