redirect subdirectory to subdomain.subdomain.domain

i wanted to change the url for my subdirectory from "subdomain1.main.com/subdirectory" to "subdomain2.subdomain1.domain.com"

i tried the htaccess code below but it doesnt work. can someone please help?

RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} ^(www\.)?subdomain1\.domain\.com$ [NC]
RewriteRule ^subdirectory/(.*)$ http://subdomain2.subdomain1.domain.com/$1 [L,NC,R=301]

RewriteCond %{HTTP_HOST} ^(www\.)?subdomain2.\subdomain1\.domain\.com$ [NC]
RewriteCond %{REQUEST_URI} !(jpe?g|gif|bmp|png|tiff|css|js)$ [NC]
RewriteRule !subdirectory%{REQUEST_URI} [NC,L]

RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

Copyright Notice：Content Author:「Mr Beh」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/59099080/redirect-subdirectory-to-subdomain-subdomain-domain