Why are there fewer and fewer websites indexed by Baidu?

The engine reduced the number of website page entries for the following reasons:
Website space
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Website Optimization
The essence of SEO is to serve search engines. There must be a degree in everything, and there should be no more. The highest level of optimization: not optimization.

Website Fraud
For example, if a large number of keywords and hidden characters are accumulated on the same page, the results may be punished by the search engine and therefore not included; therefore, the keyword density is generally set to around 2%-8%, depending on the page content;

Website revision
The first thing to do is to locate the topic and content and change the content. For pages that have been indexed and have a high weight, do not change the link. If you change the space, it is best to change it in advance to ensure that the content of the previous space will continue to exist within a period of time, just in case;

 Website link
First, the content structure of the website should be clear, the links in the site should be clear, and the webpage should be crawled by the engine. In addition, the quality of links is also very important. Junk links, I would rather not add it. If you have links to a website that is determined to be "illegal" by the engine, your website will also be affected.

Website specifications (website quality)
There are too many keywords set for the website title and page, and the website description is unreasonable. If it is a new website, set it. Don't be too lazy about the increase in website-related content, either reposted or collected, preferably original content.