I've only introduced two birds once, so what do I know? From all I've read, it sounds like a crapshoot with few good/reliable preemptive moves available at your disposal.
This was my experience: Adopted a 17-year-old female Meyer's. A year later, adopted an 8-year-old female CAG. The Meyer's did not like the CAG at all. The CAG tried to play nice and was confused when she was rebuffed.
Meyer's was mostly OK for a long time, but would also get jealous when I spent time with my CAG.
Meyer's eventually grew more and more aggressive with my CAG, and would swoop down at her from time to time. Had to start alternating their time out of their cages. They each had their own play tree in dining room.
Meyer's died of old age. CAG still going strong, and will likely stay a single bird for very long, if not forever.
I wonder if my Meyer's would have preferred a friend of the same species. She arrived at a rescue with other Meyer's who were paired off, and she was desperate to be near them, but they did not like it. Had I known she would hate my CAG, I would have likely remained a one-bird household.
I say, if it's possible, foster and see if your Meyer's takes to another bird and then adopt that one. I know a lot of second or subsequent birds are mostly for the person and not the first bird, which was true in my case, but two warring birds make life less pleasant for everyone involved. Having two happy birds who like each other and can be out at the same time and don't want to kill each other really sounds awesome to me.
I know a lot of people here make it work with birds who don't get along, but for me, the conflict took some of the joy out of living with my parrots, because there was a constant underlying stress for all of us.
I've read that it's not unusual for Meyer's to be bird-aggressive. Yours is still young and this may be a great time to introduce a second bird.
Good luck!
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