How to fix 403 Forbidden error in laravel application after hosting in a sub domain

I get the 403 Forbidden error when I try to access my Laravel application from my subdomain.

My project is outside the public_html file in cPanel in a folder called app.

And i have created a symlink to the project public_html by running this code in cPanel terminal

ln -s ~/app/public_html/ ~/public_html

And I have set permission 644 to the project directory

via Chebli Mohamed