When does Drupal 9 come to market?

I'm just wondering when the CMS software Drupal 9 comes on the market. Personally, I find that with these updates every time you face incredible problems. An Update on a new Drupal version is unfortunately not so easily possible. Especially with existing projects with many modules and content that is very difficult to implement. So when is the new version Drupal 9 coming? I am still running my Drupal 7 Website and I am not able to switch tot he latest Drupal 8 version as many modules do not exist in Drupal 8. I wonder if the version updates of Drupal will not cost the popularity of this wonderful cms.

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