Dear Dragon Masters,
We want to reassure you that the game will not shut down!
The message you are seeing on this page https://apps.facebook.com/dragoncity is just a standard message added by Facebook to inform its users that games running on Facebook and using Adobe Flash Player will no longer be available due to Adobe Flash Player ending on December 31st, 2020.
This will not affect our game since, as you know, we already closed the Facebook version of the game back in February 2020!
To keep playing, you only need to download the game for free on your mobile device or Windows 10 PC from any of the official Stores and restore your progress: https://forums.socialpointgames.com/topic/14510/how-to-save-your-game-progress
Your Dragon City team