you say that you tend to come up with lyrics and melody at the same time; HOW do you manage to repeatedly have multiple ideas simultaneously‽ i can't manage it! i just end up having to come up with a melody for the lurics i've just written or some lyrics for the melody i've written
i find the ideas are about 10 times stronger when the lyrics and melody are born together. as for how to make this happen, sometimes you have to 'set the scene'. think of a scene. usually at that point the songs just start spewing out. it's a cool new trick i've learned