Do you offer fresh foods in the absence of pellets? My technique is to feed "chop" and remove all pellets. Depending on climate, chop is served between 5 and about 8 hours. If you have been feeding the two foods simultaneously, try serving chop alone, even if your Goffins seems to avoid eating. They can go several hours without food, and this may be necessary in the beginning. However, never starve a bird into submission.
I have 5 Goffins and they almost universally enjoy the following: Lima, black, garbanzo, and kidney beans, green peas, cooked yams, cooked sweet potatoes, edamame in the shell, corn on the cob (given sparingly as they *love* it, but not the most nutritious) apple, pear, banana, pomegranate seeds, melon seeds, cooked whole-grain spiral noodles. Some will eat red and green peppers. If your Goffins is a very picky eater, a technique is to prepare identical bowls for you and the bird. Begin to eat from yours, visible enjoying each bite (even if not!) and make "Mmmmm" sounds. Birds are flock creatures, and you are part of the flock. It is amazing to watch one of my birds begin to eat, and the others follow immediately.