Hi,
Unfortunately, the NA/EU servers closed several years ago.
However, there are active Chinese servers with large English player populations.
The biggest/most active Chinese server at the moment is Wonderland Online Rhodes Island.
You can find out more information about how to register, install and play it by joining this Discord server: https://discord.gg/KhYzCuh378
There is also New Wonderland Online Mobile version available, you can find more information about it in this thread: http://wlodb.com/topics/26186
The thread has a Discord invite link at the start and upon joining it, you will be able to interact with players who are able to guide you through the installation process.