Why a GEO score climbs in steps rather than all at once
Visibility in generative search is built in three layers, and the layers work in order. The first is access: whether an engine is permitted to read the page at all. The second is legibility: whether the page says on its own what it is, who published it and which question it answers. The third is evidence: whether every claim on it has something verifiable behind it. Investing in an upper layer while a lower one is missing is painting the far side of a closed door.
That is why the score climbs in steps rather than along a line. Once access and legibility are in place there is one large jump; after that, every page that ships uses the same foundation and moves the number a little at a time. The movement in the first month is usually larger than the next six months combined — which means the work started in the right order, not that it finished.