Why didn't my bread rise much?

my bake: https://imgur.com/a/mAB0K1j

I followed https://www.youtube.com/watch?v=HlJEjW-QSnQ almost exactly. The dough looked practically the same when I shaped it. But it didn't rise much at all as in the video. I notice that the bottom is a bit denser, whilst there are large holes. Can anyone help troubleshoot?My starter may not be as powerful, it doubles every 4-5 hours. But I fermented longer. Could it still be the starter? Other underproven/overproven?

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