How would Google know to lower my ranking without a single link click?

I have several pages that were initially in position 40-50, but checking a few days later they dropped below 100.

Some say content quality is a big factor, but my question is: how would Google know the quality of my content if not a single visitor has come from search? i.e. they won't have metrics like dwell time or other engagement metrics

Any pointers would be appreciated.

submitted by /u/jytoronto
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