By working out the emotional feel of a chord, you can write a song by writing down the chords by number that you already have and then sit back and work out how you want it to feel a part of a song, and add a chord that fits the emotion.
2 = a huge lift, like a 5 but adds more flavor, 2 is great for a bridge or pre-chorus, adds color.
3 = awesome in relationship to 1, when swapping out the base note to a 3 it adds great forward motion, momentum, a color chord, it’s pushing me towards something. The 3 is great to partner with the 4 – it’s a moody, broody kind of feel.
7 = tension, it wants to resolve