Couple of weeks ago I faced a situation where I couldn't anymore make good songs, I always kind of went to a dead-end. I first thought that I just didn't do something right in the production process and even made a thread here. But then I realized it wasn't any theoretical mistake that I had done, but it was that I had just tried to force myself to make good music. That's not possible, inspiration is somethin you don't control. So now I'm having some kind of vacation of music making and I'm just trying to clear my head and forget that stressful obsession to create good music.
So I think you're looking for the same thing I was looking for: some magical forumula that helps you to create good music. There's not such a thing. You gotto let it go: the inspiration will come by itself, and then you will suddenly notice you have developed some formula for yourself: maybe you always start with melody, maybe drums. But it's not something you can plan in advance.
Hope this helped