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How am i able to repair my permalinks?

I’ve a WordPress web site utilizing permalinks that has about 350 posts with URLs which can be utilizing this normal format:

https://www.instance.com/1087-post-name/

The higher hyperlink format is like: /%post_id%-%postname%/ – I changed the slash "/" with "-" to make the hyperlink look higher. However now when I attempt to change my permalinks again like /%day%/%monthnum%/%yr%/%postname%/ I get 404 on all my pages.

I would like my hyperlinks to turn out to be like this

https://www.instance.com/02/08/2021/post-name/

How can I do this?