If you have mistakenly installed your WordPress in wp directory and if we consider it as fresh new WordPress having no data then in that case you can simply uninstall it and again reinstall WordPress.
Step::1 To do this login to your cPanel and go to Softaculous section
Step::2 Click on All Installations
Step::3 Go to your WordPress installation and click on X icon to remove it completely.
Step::4 Now again Install WordPress via Softaculous and this time Choose Installation URL as your domain. Remove “wp” which is inside “In Directory” box and leave it blank.
Step::5 Fill the required details as usual and install it.
Now if we consider that your WordPress is having some data then in that case you cannot simply uninstall WordPress. You need to follow the steps below:
Step::1 Login to your cPanel and click on File Manager section
Step::2 Go inside public_html and then find your WordPress installation directory i.e wp
Step::3 Now select all the files and folder present inside wp and click on “Move” icon
Step::4 Simply move all the contents to /public_html
Now you need to check your Database name from wp-config.php file
Step::5 Once you have noted down your database name, go to phpMyAdmin
Step::6 Click over the same Database name and tap on Export and save the SQL file into your local PC.
Step::7 Now open that SQL file in Notepad++ and replace “domain/wp” with “domain” and save the file.
Step::8 Again go back to phpMyAdmin and select/check all the tables under that database and choose Drop option from with selected drop down
Step::9 Now Click on Import and browse the updated sql file and upload it.
Step::10 Finally click on Go button at the bottom of the page.
Once this file gets imported successfully you will find that your WordPress has been moved wp folder to public_html without any issue.