Hi NancyO! I had a GCC for about 6 years who chewed. He was a rescue and didn't chew at his not so great home but then began chewing/clipping when he got to us (it didn't help that he got very sick a week or so after we picked him up - we think because of the terrible condition of his former cage). This was very upsetting for us! He had lots of toys, lots of good food, lots of attention so the vet thought it was perhaps hormonal. Charlie chewed his whole life but was seasonal, meaning that he did it mostly when he was molting or very stressed. He was healthy, very loved and very busy so we ultimately just accepted that this is who he was.
Some advice that we received that helped a bit (as we thought it could be hormonally linked) was:
1. consistent, regular bedtime with 10 - 12 hours of sleep in a dark quiet room. Charlie had a sleep cage in another room with nothing in it that was nest-like - just a perch.
2. never pet him on the back.
3. Don't let him find/make nests: we tried to encourage him to play with toys and roam around rather than explore holes and dark corners.
4. ignore hormonal behaviours such as regurgitation - we would walk out of the room or distract him when he did it and remove any toys that he regurgitated for.
5. Regular baths/showers (sink, spray or water dish).
Oh and as for veggies, keep offering them. It took us over two months to get our Charlie to try them. Try different sizes and ways (chopped up small, clipped in large pieces on the side of the cage, etc). Peppers were a great favourite, same with peas. You'll get there!
I know how stressful this feels, but know that you can do everything right and they still might chew. It doesn't mean you are a bad parrot friend! Sending lots of support from one who has been there.
