Sourdough starter refuses to rise

Day 9 with bubbles and a sour smell usually means the bacteria are ahead of the yeast, which is the normal way this stalls. The fix is usually feeding ratio, not time: move from 1:1:1 to 1:5:5 so the acidity drops between feeds.

That curve is the tell: it peaks around hour three, then collapses. Peak at three hours means you are feeding it too late, so it spends most of its day starving in its own acid. Feed at the peak, not the next morning, and the doubling shows up within two or three cycles.