i'm writing a country song, and i've got a basic chord progression down for the verse: d a g, but i'm having trouble coming up with a chorus.

i'm not asking members to come up with one for me, however any tips or advice on how to do it myself would be greatly appreciated. thanks in advance!
add a minor chord in there and juggle the verse chords around. D Bm G A. And/or change strumming/picking pattern :P