keywords ranking disappeared from Google search

[unite]

Suddenly some of my keywords ranking disappeared from Google search, While some keyword’s ranking has been dropped. what would be the reason? And yeah I’ve checked google search console, There’s no message under manual actions. I type site:mywebsitename, Search engine shows all pages. I am confused, what happened. Have you any idea, what is the possible reason?

[pavanear]

This is the most pressing topic for any webmasters or marketers. Because of Google punishment? Because of a server failure? due to the robot.txt setting? There are numbers of opportunities but Google would negative tell you how?  Doing the website owner, you want to actually attempt it out yourself.
there are many reasons behind it.
Due to content updatation,  due to spam links and due algorithms update

[pavanear]

yes, it will be same as competitors also and search engine( google) is equal to all .not for one who is ranking. google will punish if you did spam on your content or building links.

[SeoDezin]

What you are facing sometimes happens when google announce any update and your website and your current offline activities doesn't support Google standards of ranking

[AmitVermaSPS]

This is the most pressing topic for any webmasters or marketers. Because of Google punishment? Because of a server failure? due to the robot.txt setting? There are numbers of opportunities but Google would negative tell you how?  Doing the website owner, you want to actually attempt it out yourself.
there are many reasons behind it.
Due to content updatation,  due to spam links and due algorithms update

You can attempt & diagnosis following major types of Google ranking Drops;
1. Manual search engine penalty.
2. Search engine algorithm update.
3. Check if Google Crawls the Website - Go to the Crawl Stats page of the Google Webmaster Tools: Crawl > Crawl Stats
4. Lost website links
5. Site redesign, migration, or other changes
6. Negative SEO- Negative SEO is a set of activities aimed at decreasing a competitor's site rankings in search engines' results. These activities may include knowingly building spammy, unnatural links to the site, content scraping, and even hаcking the site.
7. User behavior changes- impact of user behavior on rankings is a controversial topic in the SEO space.
8. Thin content