Hi! Welcome!
Here's my usual yadda-yadda on food.
As you doubtlessly know, they need veggies, legumes, grains... pellets are a good staple. Seeds are only a treat in my house. Here's what I've used for 40 years with the same bird.
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I feed Harrison's, supplemented by fresh healthy treats. My first, and later, my current avian vet recommended it. My bird loves the pellets now, but to get him converted, my avian vet suggested putting pellets out all day, and putting seeds (his old diet) out for two 15-minute periods a day. That would sustain him but leave him hungry enough to try new stuff. I presume the same technique could be used to get him to eat other healthy stuff, like fruits and vegetables! My guy was eating pellets in a couple of days, and now I can feed a good variety of other stuff, knowing he has the pellets as a basic. Pellets are out all day... fresh treats a few times a day. I also like Harrison's via mail because I never have to worry about out-of-date products.
Another couple of ideas...
My ol' man is an athlete and health nut. He actually EATS all the good stuff, so it's always around. I find that tossing various stuff into the food bowls at random is good... the variations and differences seem to stimulate curiosity and attention.
The other idea... if you can stand it (lol) EAT the stuff in front of the birds, yes. That encourages them. I have also found that if my ol' man eats stuff in front of the bird, the bird WANTS it for himself. Kinda a rivalry thing!
In case you're a new parront, I'll just drop a note about avoiding teflon pans, which can be lethal to birds if overheated.
I'm glad you're here. Lots to learn and share and enjoy!