I'm finding it may be related to special serps features and how many your pages lost.
frankleeceo
8:04 pm on Jan 1, 2021 (gmt 0)
I saw nonstop movements for the good part of past 2~3 weeks. Things seemed finalized 1~2 days after Christmas. It wasn't a recovery but a final ranking / traffic stabilization.
For my particular site on a WoW basis based on traffic volume. I generally drift higher over time due to more content. Until ranking signals that make significant changes that push my volume back to a specific level. Back to the throttled ceiling. I'll put some imaginary numbers for a better perspective. The percentage is true, but the numbers are fake for number reading purposes.
Starting point: Assume 10,000 Jan 12 2020: -40% = 6,000 May 4 2020: +100% = 12,000 May 4 2020~ December 4 2020: Drifted overtime +10% = 13,200 December 4: 2020: -40% = 7,920 Decemer 4~ Christmas Eve Drifted lower -30% till Christmas. = 5,500 (conspiracy anyone? Google pushing more ads during this time to kill organics?) It's now stabilizing back at +30% compared to December 4 it's 0%. = 7,920
After 1 year of working and improving my site. I end up with less traffic sadly. (However, the competition in my niche is indeed getting more fierce). But an important keyword term that I closely following is pretty bad. So yeah. It's Google's nonsense AI IMO.
It is domained crowded by a site with three entries on the SERP. That is the worst than all of the sites. Then Google crowded Youtube / Dictionary definition on top of my entry. Effectively pushing my 3rd~5th position all the way to 11th.