Perhaps reduce the number of rays?
Or go with a sun of rings:
I will go with a variation of this, as I've read that ancient Atlantis has three circular canals.What about hybridizing the sun designs? Put a blue dot in the center of this sun to symbolize the traditional five rings of ancient Atlantis and make the rays longer like the original design for the ten tribes.
Confederation of Atlantis
It was in August 1871 that a united Atlantis could be said to exist once more. In the face of continued encroachment by Britain, France, Spain, and Portugal, the archons and autocrats of the island of Atlantis, from the mountains of the north to the plains of the south, yielded to Atlantian nationalism to form the Confederation of Atlantis - a union of brother-kingdoms once more ruled from the ancient city of Poseidonis in shadow of the Trident Mountains. It had been nearly 2500 years since a mostly-unified Atlantis was ruled from Poseidonis, when the Ancient Atlantian Empire, consisting of ten kingdoms said to be founded by sons of Poseidon, had imposed its will over the Atlantic coasts of Iberia and North Africa until it was destroyed circa 600 BCE by a seismic sea wave caused by the eruption of the volcano internationally known as Cumbre Vieja in the Canary Islands.
The flag design reflects more on the ancient history of Atlantis than the modern state, with ten stripes and a sun with ten rays for the ten ancient kingdoms, and three blue circles within the sun for the three canals which ringed the ancient and modern capital city of Poseidonis.
More backstory to come whenever I figure it out