I really wish she would take a leaf out of for example Clive Cussler book.
Find a writer or two she really trusts to stay with her vision and ideas and let them write new full books set in the Potterverse.
With quality control it could work.
Books can be set anywhere within the timeline of the main series or after or long before even grindelwald was born.
Lets see what the goblin wars were like and all about.