Unsubscribe page

Hi,
what would be the best option to signal in a nice way the effective unsubscription?
Because as it is when clicked unsubscribe in the email you get
this with Lovecraft template ;

maybe using the post page url and adding the message will be better
or create a cancellation page and using it in the admin ?

hope that helps

https://ww.wp.xz.cn/plugins/subscribe-to-category/