Why are visitors down?

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Suddenly my website's users have decreased a lot. I work with a food and drinks website. Every month I give a total report to my client along with update of website visitors. But since last June my user has decreased a lot. This is the continuation, gradually the visitors are decreasing. However, I do local SEO, so there is no need for other country users. But since I have been reporting there were a lot of users from foreign countries.

I tried to extract all the data from google analytics but can't find the reason. When there were more users, direct search and users from other countries were more. And I did not work on the page which had more visitors. Many users used to visit one page of financial page. But now the visitors have gradually decreased of this page. Now the organic search is more and the pages I work with have more visitors.

But my client wants to know why the visitor has decreased, I can not find the reason. My client has a backlink on that financial page that they provide for their stock market work. But there are more local users.

Please give me a solution.

Thanks

Google’s Spam Update

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After google's spam update my websites' visitor decrease a lot. Even many of my backlinks has been broken. So what is need to improve to increase my website's visitor.