IF you know what pages were looked at,
and then see changes that impacted the rankings of those pages,
you "may" have a framed feature set to look at (rather than guessing 400+ possibilities).
But...
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.... the problem is you don't know if it's an actual feature on your pages/site, or one that you are lacking!
Which is why it's so important to know who/what else ranks, and where.
Then you can compare between and look for correlations and differences.
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And it's the latter that is often missed out by "SEO Guides" etc.
It may not be anything on your page/site.
It may well be others went up because they have something you lack ... and spotting what is "missing" isn't always easy :(