When I first started my website and didn't really know what I was doing so I made the permalink include the date in the permalink. This is problematic because if I were to change it to the simple website domain name and article name for the rest of them, it would change the old ones as well. If it changed the old ones it would have to be re-indexed onto google and all the backlinking from other places and interlinking would be broken.
I thought to change it and redirect the links with dates to the new permalink format, but I have tons of articles, and doing it manually would take forever.
Is there any way to make the future posts on WordPress use a different permalink format while keeping all the old posts having the same link?
Or is there a way to make all of the links on the website change to different permalink format without completely breaking indexing, backlinking, and interlinking structure?
To clarify I now have Month and name and am trying to change it to Plain.