First of all, omg, it must be a really heart broken feeling to experience this.
Can you try a couple workarounds my friend?
If you go to your Admin panel, top left line you’ll see a little box. Type the number 60 in it and hit the apply level button.
This way your character may take back your lvls.
Another workaround is to recreate character. Of course when you recreate character you loose you old ownership but this can be almost fixed if you press the option in your settings “no ownership”. That will allow you to use your old builds.

Last is delete the game and install it again. But before this try to log in on an official server. Once said in here by a dev that logging in on official servers, your game may retrieve lost data and start acting correctly.

I am sorry for what you’re experiencing my fellow exile, welcome again and happy new year!