Inserting Directory to File Path Via .htaccess

https://benedictinewomen.org/

I accidentally set our blog’s permalinks during development so individual posts publish to the root directory, like this:

https://www.benedictinewomen.org/post-title

This means categories published like this:

https://www.benedictinewomen.org/category/sample-category

I have now corrected Permalink settings to individual posts publish to a blog directory, like so:

https://www.benedictinewomen.org/blog/post-title

How can I write a redirect so that all the category and tag links around the site work again? So for example, a link to:

https://www.benedictinewomen.org/category/sample-category

would redirect to

https://www.benedictinewomen.org/blog/category/sample-category

Thanks!