i made a pitch last year that was about there being other islands beyond the borders of Artakha.
Many of the characters you all have plans to introduce as matorans, i have thought about introducing as the main players of a massive war that is still happening while the events of G3’s three years were going on.
Before the three brothers created the island of Artakha, Mata Nui had created the world and filled it with many variations of creatures and intelligent life. These includes the Vortixx, the Skrall, the Mahri (what i am calling the Barraki’s species), the Elementals (who later de-evolved into the Elemental beasts) and more. many of these races forged empirers after the three brothers put Mata Nui into his eternal slumber and have since then been fighting amongs each others in order to gain supremacy over the world.
If any of you wish to discuss my idea of this, please give give your own take and feedback in the topic i have linked.
also, just a side note, another one of my ideas is that there excist no Matorans outside the island of Artakha, Matorans are unique to the island because they are one of the few creatures who are able to control elemental energy and the only species who can become a Toa. Plus the fact that they were created by the three brothers and not by Mata Nui.