Conure conundrum, please help

I’ve asked for advice on this situation before but again have found myself in a conundrum, here’s my situation:
I currently own 3 conures, I’ll reference them as 1,2 and 3 to stop confusion but don’t be worried, I genuinely love them all very much. 1 is the birdie I got first, 16 months ago when she (unsexed) was 3 months old. 2 is my second birdie that I got 15 months ago (unsexed) age was under 6 months when I got him but unsure of definite age. And then number 3 I got a year ago (unsexed) approximate age 6 months when I got her.

After various quarantine routines etc I slowly introduced them all to one another and they all seemed to get along in the end. They’ve all got seperate cages but get along and loved spending time out together. I’d leave them in my aviary unsupervised and they’d be fine in the warm sun!
As of approximately a month or so ago they’ve got on beautifully, but suddenly my ‘number 3’ has starting attacking ‘number 2’. My original birdie (no 1) has always tried to place herself inbetween them to stop the fighting but regardless number 3 has fought quite roughly with number 2.

Number 1 still gets on brilliantly with either and they get along with her individually but number 3 won’t leave 2 alone at any time.

So, what should I do?
Do I let them have it out and decide who’s above who on the pecking order? How far can I/should I let them go before intervening? Have broken them apart after falling in a ball to the floor before and having small cuts on the feet so they get pretty gritty!
Should I consider rehoming one? If so, who?! I know that’s more of a personal decision but truth be told I don’t want to rehome any of them! It makes sense that last one in should be first out but number 3 seems to get on better with number 1 than 2 does so I’m not sure.
It has been suggested to me that adding another could mean that they seperate into two pairs and live happily with respective partners but again there’s the risk of either them not liking the new comer or number 3 still attacking number 2 or even some hanging up!

Ultimately I’m not sure what to do and am looking for some advice from some experienced in situations like this, even is it’s not necessarily conures. Many thanks for any help provided!

I have multiple birds, and I have squabbling.
They are not out together with out me.
I do positive reinforcement with the squabbling birds. If A and B aren't getting along, I take just those two out and feed treats when they are next to each other. I step in and stop any fights before they happen if I can read that one is going to happen, or as soon as it does happen. I move them a little farther apart and start again. If someone is just plain cranky they go back and I try a different day. If all my birds are out and two aren't getting along I out the trouble maker back in the cage. Then later I let them out but put the one they didn't like back. So that everyone has time out.
I also set up several areas that they hang out, each bird has their favorite space. If they leave that space to fight I out them back in their spot. If it keeps up they go back to the cage. Over time and lots and lots of repeating they do pretty great.
All the birds can sit on me like an inch apart and behave. But they can't be that close without me.

Also spend time watching the flock interact. I had my GCC attacking the budgies. So I thought it was a problem with the GCC. But after watching them my Quaker was driving my GCC crazy by try to have sex with her all the time, by bossing her around ECT. So giving the GCC a break from the Quaker almost stopped all attacks in the budgies..
I try a d rotate do all the birds have time out if the cage by themselves too. Not all in the same day , but a rotation everyday of whis turn it is.

I would have them sexed. It could shed some light on the dynamics. I'm a big believer in not mixing the sexes in like species unless 1)you want them to mate and you know what you're doing 2)you can have a large flock so they can pair off naturally.

Otherwise, Laurasea gave some good advice. I wouldn't leave number 3 and number 2 together unsupervised.

Pecking order is sort of a misnomer in parrots. This is the risk of getting multiples. This is why they always say not to unless you have enough time to tend to each one TOTALLY independently of the others.
Do not allow them to "figure it out" on their own. You could end up with a dead or seriously injured bird.
If they do not get along, do not push it---you are playing with fire.
Sometimes time will help, but seriously, some birds just don't get along and allowing them to deal with it could be deadly.
Unless I am misreading this, it sounds like most haven't even hit puberty yet, and that will present additional challenges, given the fact that you have 3 birds (3 is a tough number).

It sounds as if the first thing you should do is get them all sexed. 2 boys and one girl could mean problems between the two boys. They are all just at the age of puberty - don't leave them unattended they could really damage one another.

Laurasea said:

I have multiple birds, and I have squabbling.
They are not out together with out me.
I do positive reinforcement with the squabbling birds. If A and B aren't getting along, I take just those two out and feed treats when they are next to each other. I step in and stop any fights before they happen if I can read that one is going to happen, or as soon as it does happen. I move them a little farther apart and start again. If someone is just plain cranky they go back and I try a different day. If all my birds are out and two aren't getting along I out the trouble maker back in the cage. Then later I let them out but put the one they didn't like back. So that everyone has time out.
I also set up several areas that they hang out, each bird has their favorite space. If they leave that space to fight I out them back in their spot. If it keeps up they go back to the cage. Over time and lots and lots of repeating they do pretty great.
All the birds can sit on me like an inch apart and behave. But they can't be that close without me.

Also spend time watching the flock interact. I had my GCC attacking the budgies. So I thought it was a problem with the GCC. But after watching them my Quaker was driving my GCC crazy by try to have sex with her all the time, by bossing her around ECT. So giving the GCC a break from the Quaker almost stopped all attacks in the budgies..
I try a d rotate do all the birds have time out if the cage by themselves too. Not all in the same day , but a rotation everyday of whis turn it is.

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Wow Laura! That's an AMAZINGLY helpful post!!! I've definitely got to work on those tips with my boys.
THANK YOU!