Redirect In Htaccess

Hi,
I am trying to do what I thought would be a basic redirect in htaccess but am having a lot of problems. Basically, I’ve changed my structure so that now for a category the permalink is https://www.soundsandcolours.com/travel instead of https://www.soundsandcolours.com/content/subjects/travel/ so I am trying to create a Rewrite Rule to do the redirect. Is there any way to create a simple rule that will do this redirect for all of my categories? My attempt at trying to do the redirect for just the Travel directory is below but this wasn’t working. Any ideas why?

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^content/subjects/travel(/.*)?$ /travel$1 [L,R=301][L,R=301]
</IfModule>

Thanks!
Russ