echo "PATH=/opt/plesk/php/7.1/bin:$PATH" >> ~/.bash_profile
Replace the version number with the one you have set.
Then close out the terminal and reopen. Run php -v and you should see the correct version.
php -v
PHP 7.4.27 (cli) (built: Dec 23 2021 14:48:17) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with the ionCube PHP Loader + ionCube24 v10.4.5, Copyright (c) 2002-2020, by
ionCube Ltd.
with Zend OPcache v7.4.27, Copyright (c), by Zend Technologies