oh my goodness I could talk about this forever!
(this is assuming that the world is ideal and all birds are non-endangered and available!)
a red-tailed black cockatoo!; major mitchell/leadbeater cockatoo; an ultramarine lorikeet; rosellas; a mulga parrot; a bluebonnet; alexandrine parakeet; derbyan parakeet; all macaws really; blue crown conure; sun conure; patagonian conure; austral conure (or slender-billed); green cheek (of all colors), black-capped, pearly, painted, white-eared, and white-necked conure; blue masked lovebirds; cuban amazon; red-lored amazon; a blue yellow-nape would be so frickin amazing!! (have you seen those?); blue front amazon, yellow-faced amazon, vinaceous amazon, red-crowned amazon, st. vincent, st lucia, and imperial amazons; double-eyed fig parrots; edward's fig parrot; eclectus, pesquet parrot, red-rumped parakeet, masked shining parrot, quaker/monk parakeets, english budgies, brown-neck parrot, greys, citron crested cockatoo!, galah cockatoo, a Rajah Lory (subspecies of black lory), red-breasted pygmy parrot
and I would continue but eventually i would leave the parrot realm and go on until I had named every bird in existence as well as various extinct species including, but not limited to the carolina parakeet and the cuban macaw and spix macaw (not yet technically extinct, but pretty much :c) and Archaeopteryx
realistically though, I'd love to work on helping endangered parrots and breeding unreleaseable pairs to get offspring that are raised to be released.