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We are redesigning our WordPress site (over 1300 posts and pages) and are on schedule to launch in May of 2021. Should we wait for after Google's Core Web Vitals & Page Experience algorithm update?

I am trying to make some redirects so we don't lose that SEO juice.

I am trying to move our blog structure from:
http://www.domain.com/2015/09/title-of-blog

to:
http://www.domain.com/blog/title-of-blog

I need to do redirects in htaccess from the old structure to the new structure but I can't seem to get it working properly. Here is what I have thus far.

<code>RewriteEngine on
RewriteBase /
RewriteRule ^(.0-9)\/^(.0-9)\$ $1/ [R=301,L]</code>

Any suggestions?