There can be any number of reasons why buying web traffic can drop suddenly and significantly. This can be an issue with something as simple as your analytics code being removed accidentally after a website update, or something more severe.
There are many things to check to determine why your web traffic dropped, so below is a list to start with.

Changes in Google
Google releases several hundred changes to its algorithm every year. Some of these are major—like Penguin, Panda, and Hummingbird. Others are just minor updates that you will probably never even notice—and will probably never affect you. When Google does release a larger update to its core algorithm though, it can result in major changes in the search rankings. Still, these updates might not have any impact on your traffic. Keeping a regular eye on your analytics and your impression data in Google Search Console can help you determine if you’ve been impacted by any of these changes. Ranking reports can also help. Just don’t rely on manual searches of your keywords to try and see how you’re ranking. If you do notice a huge drop in your organic search traffic, then it might be time to adjust your SEO strategies.
Not investing in SEO
With better ranking, the chances of getting steady website traffic significantly improve.Remember, don’t optimize once and forget about it. It’s a full-time engagement. You need to keep at it to get it right and stay ahead of the curve.Google continues to test your SEO toolkit with its changes in algorithms and other things. If you are not at your best with SEO techniques, you’ll end up wondering what went wrong while the traffic steadily declines. Your SEO tricks can be good, but outdated. Google continues to reinvent everything. Try to keep up with it.
Change in Consumer Habits
Identifying what has changed is a fascinating research area. The challenge is to sleuth out what changed in order to understand the wholesale shift in what people are searching for.Traffic going down for one site sometimes correlates to the traffic of another product or service going up elsewhere.The most dramatic example of this effect I have encountered involved the shift digital photography habits. In this change, sites related to digital cameras started losing traffic after the iPhone became popular.
Low-Quality Content
Content is at the core of all business growth strategies. Without great content users won’t engage, Google won’t rank you, and the risk of being affected by a search engine update increases.We have written about content quality over and over, and yet still find websites who are creating low-value, generic, 500 word articles that provide no value.There are two parts to of content that we find issues with the most.
Slow site speed
Slow site speed leads to poor user experience. Google deems it unacceptable and ranks it lower.When a page doesn’t load, it’s easy to guess what the user is going to think or do next. They’ll make a mental note to never return to this site!This is how, bit by bit, the traffic slows down, due to users who get annoyed by the website speed.Google’s quick to capture this and rank you accordingly. Gradually, your ranking comes down and eventually it may stop the traffic altogether.