Alot of birds at first do not eat the veggies or fruit you offer them. Have you tried chopping the veggies or fruit into tiny pieces or grating the carrots?
Have you tried sprinkling some millet seeds on the veggies?
I know it seems like a waste when they do not eat what you offer to them. Try to continue to offer them to your budgies diet daily. It might take a while for your budgie to accept the veggies.
Have you tried offering your budgie some lentils and grain like brown rice, couscous, split peas?
I've tried chopping up the fruits and have offered carrots multiple times but he doesn't eat them.
I haven't tried the rice or peas, and neither the millet.
I got some today so I'll keep that in mind.
thanks!