You can use CloudLinux's Select PHP Version to change your website's PHP Version. CloudLinux provides various PHP Versions to choose from.
1. Log in to your Plesk account.
2. Click on the Pull icon in the right sidebar and choose PHP Selector.
3. To the right side of the Current PHP version, click on the drop-down menu and choose the version you want to use.
4. Click Apply.
You have successfully changed your PHP version using the CloudLinux Selector in Plesk.