1. Algorithm update
Google frequently updates its algorithms for the search engines to make it better for the users and for many websites this becomes a primary reason in the drop in their traffic.
2. Segment drop
There is a possibility that there has been a drop in one particular segment of your website. It is crucial to categorize data and then decide what segment has seen the fall.
3. Penalized
Google can penalize your site and not show it in the search results if you violate specific criteria set by Google and it is advised to take measures to prevent this and check the Console for any messages related to this.
4. Outnumbered by competitor
Sometimes your competitor can outnumber you and your ranking can drop very significantly because of that. To get ahead of what you need to research methodically and find out what is it that works for the competitors.
5. Drop out of pages
To check if your pages have dropped out of the index or not you need to check the Console and see the Status Report. Check to see if you have very few URLs.
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