A page climbs to the bottom of page one and stalls because relevance got it that far, but the last few positions demand an authority and satisfaction edge it has not yet earned. Reaching position eight means Google judged the page relevant enough to belong on the first page. Climbing past it means competing with results that hold the top spots on something more than relevance: stronger links, a closer fit to intent, or a longer track record of actually satisfying searchers. The page sits where its relevance places it and stops where its missing edge begins.
The mechanism is relevance-got-you-here-authority-gets-you-higher. The first page is roughly the set of pages Google considers credible answers, and inclusion in that set is mostly a relevance call. Order within the set is decided by harder signals: the authority a page has accrued, how well it matches the precise intent compared to its neighbors, and proven user satisfaction such as searchers clicking it and staying rather than bouncing back to the results. A page can be fully relevant and still lack the depth, trust, or satisfaction record the top results have built, and that gap is exactly the plateau at position eight.
This is why the instinct to add more keywords does nothing here. The page is already on page one, so relevance is not the bottleneck, and stuffing in more terms cannot manufacture the authority or satisfaction the higher positions reward. The plateau is a signal that the remaining distance is an authority-and-quality problem, not a relevance one, and treating it as a keyword problem just spends effort on the lever that is already pulled.
Diagnose which edge is missing before you act. Compare your page to the ones above it: do they carry more links and topical trust, do they fit the intent more precisely, do searchers seem better satisfied by them. Then invest in the gap that is real, deeper satisfaction, stronger authority, or a tighter intent match, rather than reaching again for keywords. The climb past page-one’s floor is earned with the edge the top results hold, so find which one you lack and build it.