Actually, the question is in the title of the topic. Now all I can do is delete my characters from the servers and uninstall the game?
Sadly, the short answer to your main question is ‘yes’. The longer answer is that you will be able to continue playing the game, but only on the old version, and only on private servers or singleplayer. Quote:
PC players (including Epic Games Store and MS store) who want to continue playing the UE4 version can do so by switching to Conan Exiles Legacy, but this version will not receive additional updates, support, access to the Bazaar, or official servers.