Q: Or would you in this situation instead move into a new key using Gmaj7/A as a stepping stone, kinda like the harmonic movement in the "Stay for a while" bit in "if the world doesn't end". This movement would open up the possibility to modulate to D but idk enough music theory to go somewhere other than that with the suspended voicing of A major which is Gmaj7/A
A: most of the time you'll probably come up empty handed if you are trying to draw the entire road map using chords alone. the important turns usually want to be guided by all available context elements, together (words, melody, chord, the whole sound, the whole context, everything that's going on)