What I would suggest is creating a new editions, merging with the previous and select the new ones as default/primary. You can do all of this as the author. This way, at least, readers won't see the older covers unless they look at the other editions.
I'm revamping my books and starting again with publications.
Can you please delete all my books so I can start again with covers etc...?
https://www.goodreads.com/author/show...
Thanks