Everything has a fix B.

That's why I said what I said. Personally, I see you as a sun conure kind of guy. I know, it sounds crazy, but I seriously see you with one. Just a hunch.
Conures are super birds! I am around them all the time. Yes, they can be loud sometimes, but with training, they have certain times they're allowed to be loud. They are very, very smart, easy to train all sorts of tricks. In fact, when I work with the conures (mostly suns) these are all the tricks I've taught them in a few months:
step up
being picked up by the beak
basketball
skateboarding
wings
turn around
and lie down
Of course, they were babies, but still, they learned all of that amazingly fast.
It's okay to have variety B. I do. If you really want a change, and are looking at conures, do some research on them, watch videos of them, check some out at the flea market or that Sinbad's bird store. Maybe you do need a change. There is nothing wrong with wanting something different. Really think about this, and then if you still feel this way, maybe start to go through the birds you think you could do without and the ones you cannot lose. If you reduce your numbers, it could be possible to have one conure share the aviary with a small number of birds. Although it does depend on the size of your aviary.
Really think about what you want to do. Write down some positives and negatives on a piece of paper and wait a week. If you still feel strong about this, maybe it's time to do something.