Your Omlet coop and run is actually 30.5 sq ft I'm afraid. It is 2 meters long, or 6 1/2 feet (78 inches), and is about 47 inches wide at the base. The Cube coop really can't do more than 6 full-size chickens, somewhat more bantams, though I have heard of some that have managed more. But I believe those are free-range situations mostly.
The very best place for reliable chicken advice from experienced chicken-keepers is here on BYC. But, you can get some advice and ideas specific to Omlet set-ups from other users in the Omlet Facebook group. See if this works:
https://www.facebook.com/groups/809...vy2crtZQap0T5W7lFojC62ZAWfK8Uk&__tn__=-UC,P-R
You should consider hardening your Omlet run with at least two feet of 1/2" hardware cloth all around (get black coated, so you can see in, I liked that best). Raccoons and weasels can easily reach in and grab I'm afraid. Weasels can actually get in. You may also want to consider certain latches or at least child-proof doorknob/stove covers for the Cube back and side doors. Omlet is based in England. Their coops and runs were designed with fox and hawks in mind. They do not have nearly the predators we do.
My advice is to get another Cube, or an Eglu Go, or some kind of coop and run for your 3 new hens if you want to keep them. That is what I would do if I added another group of that many. Physically and socially it will work out best. But that's just for the sleeping and laying coop.
In any case you need to make way more space for your original 6 and for the new 3 wherever they end up, 30 sq ft is bare minimum for even 3 hens. The replies here about personal space, visual blocks and obstacles are valuable, with your hens' best interests at heart!
I have a small flock of 4 full-size hens (I had 5 with one added rescue), in a Cube MK2 and a 3.5-meter (11.75 ft) run. This opens into a 3x4 meter walk-in run that includes various kinds of clutter, logs, chairs, etc. In Summer I did move the Cube & run, and moved a smaller walk-in run occasionally, basically rotating the Cube around the walk-in run, opening different panels to the run and opened to (just in Summer) two moveable 10x13 ft greenhouse frames covered in strong knotted aviary netting. The complex was surrounded by moveable electric fencing. We have bear, fisher, coyote, weasel, raccoon, possum, large & small hawks, eagles here, plus the occasional loose domestic dog.