Oh just keep trying...
sometimes it takes months or even years for them to try or eat anything new.
Japie has been here for 3 1/2/ years of so (could be 4 1/2, I forget) and still does not eat bananaas.
(Just an example, I suspect he would live quite happily on just pellets given the chance.)
Only once in a while he will lick at one or even have a few molecules for taste and texture - while 2 feet away from him Appie is busy stuffing herself -> so he has a great example there.
(Sunny wil join in the "give me more banana"-chorus.)
Japie still sticks to his "bananaas will kill you"-attitude.
He gets offerend a try/ bite every time bananaas are on the menu- but "no".
He also really distrusted millet ...till he saw 'the other parrot' happily munching away.
Now he hoovers it!
She hated pellets at first, but now has decided breakfast is not complete without them...
and if you grey really does not want to eat them...they make edible toys...
(even use them as babyshaker/ noise material etc.)
It always nice to have materials on hand that are in no way harmfull to the bird.
Japie has this game where he will take something from your fingers ...move a few bars, and then drop it to the floor (outside the cage) -> you are suppose to retrieve it for him and the cycle starts again...
He will find a new spot every turn, and repeat it 20+ times.
Trust me, pellets make great toys

.