Fix 403 Errors on WordPress Site

I am facing a 403 error issue on my WordPress site. The problem arises when trying to access the /blog/ directory, which needs to be retained for old image paths. While the old image paths are functioning properly, the /blog/ path leads to a 403 error.

The main tasks for this project include:
- Diagnosing the cause of the 403 errors
- Implementing the necessary fixes to enable access without errors
- Ensuring that the fix does not interfere with the functionality of the old image paths

I have not made any recent changes to the .htaccess file or the server configuration. However, I am not certain about the specific permissions set for the non-WordPress directory. There are no security plugins or firewalls in use on the site.

Ideal skills for this project include:
- Proficiency with WordPress
- Experience with server configuration and .htaccess
- Ability to diagnose and fix permission issues