Hello! In the beginning of December a new Wiki named PianoHistory was created, and some pages were written. In the end of December here comes the sudden notification that Wiki named PianoHistory was created again and one can't access previously written pages.
Sounds like it's just that you don't have permissions to access the wiki. Go to https://meta.miraheze.org/wiki/Stewards%27_noticeboard#Permissions to request that your bureaucrat and sysop permissions be restored.