Migrating Subfolder content to New domain Safely

Hello BlackHaters ,

I'm currently facing a challenging situation and would greatly appreciate your expertise and guidance.

I own a domain, example.com, primarily focused on the digital agency niche. About three months ago, I created a subfolder, example.com/folder/, dedicated to job listings which is a completely different niche. The subfolder has around 120 posts and pages.

Unfortunately, since I created the subfolder, the rankings of my main site have been negatively impacted. I was previously ranking #1 for all local digital services keywords, but now, only 2 out of 16 keywords have maintained their positions. Other pages have dropped to positions 30 and beyond.

I'm considering a solution and would like your advice: I'm planning to purchase a new domain and migrate the content from example.com/folder/ to newdomain.com. However, I want to ensure a smooth migration without affecting the main domain example.com rankings and losing backlinks from example.com/folder/ pages.

Is moving the subfolder content to a new domain a viable solution? And how can I effectively redirect all pages from the subfolder to the new domain while preserving page ranks and backlinks?
I wish they did, but GSC doesn't offer a solution to migration content from subfolder to a new domain.

Help a fellow blackhater. Thanks for giving a hand.

1. Move the website files/database
2. Change the website URL through a database query or some plugin, for everything
3. Redirect everything from the old subfoler to the new domain, you can use the htaccess rules bellow
   
   Code:

   RewriteEngine on
   RewriteRule ^example-folder/(.*)$ https://example-domain.com/$1 [R=301,L]

You don't really need to move the subfolder in GSC, a 301 redirect should be enough,
That will time some time tho, you have to be patient ^^