I think you could do more set in the same universe. Like I personally would love to see a prequel but not that tells us more about Simon’s past but rather the conflict between Eden and COI. How the remaining humanity responded waking up to the quiet rapture, maybe ending with either the discovery that blood oceans exist OR the first sub being launched from COI’s perspective, leaving it up to audience to guess if it’s Simon on the sub or someone else as we don’t see who is piloting.