Your website may seem fine one day then perform poorly the next. This may be the result of Google de-indexing it or some of its internal pages. Solving its symptoms may allow these problems to come up repeatedly; you’ll need to address the causes to get back on track.
Experts from a Denver-based SEO firm cite the following reasons Google may have de-indexed your website.
Unnatural Links Directing to and from Your Site
Google can easily detect an uptick in the number of links that direct to and leave your website. This can be a number of red flags to the search engine. This may indicate poor quality guest posts meant to just get a link, the acquisition of several inbound links in a short time (this may signify you bought them), and spam commenting on various blogs in your niche and participation in link farms or exchanges.
Concerns about Content
Content has remained king and queen of optimization and search engines for some time now; it still reigns supreme today. Google puts a premium on quality, relevant and information-rich content. If the search engine deems your pages full of spun, scraped, thin and spammy content, expect it to drop in results pages and lose its link juice to connected sites. Small things such as poor spelling, bad grammar, and irrelevant articles, images or videos can result in a decrease in rankings as well.
This strategy involves providing Google and other search engines and visitors with different URLs or content. This tactic is a definite red flag for Google, which may take immediate action to penalize those doing this.
These are some of the reasons Google and other search engines may have de-indexed your pages. Once you identify one or a combination of these, take immediate action to correct them and regain any lost ranking.