What are the signs that a website has been demoted? How to solve the problem?

Recently, a friend sent me a private message, saying that his website suddenly had no keywords, and asked me to help check what happened. After I helped check the website, I found that his website had been demoted (because the homepage of the website was hacked). What are the manifestations of a website being demoted, and how to solve the problem of website demotion? Let’s follow Feng Chao from Dongguan to find out more!

Symptoms of a website being demoted

(1) Multiple previously ranked keywords disappeared at once (2) Website traffic dropped dramatically

How to solve the problem of website demotion?
(1) Check the website server to ensure that it is operating normally in the recent period. (2) Combine Baidu algorithm and conduct self-inspection. (3) Check whether the crawling frequency has dropped suddenly. (4) Check whether any website in the friendly links has been blocked or hacked.