Cron Job for WordPress on siteground
On Siteground I use the wp-cli method as I find that more reliable:

/usr/bin/wp --user=USERNAME --url=https://EXAMPLE.ORG --path=/home/CPUSER/public_html --timezone="PHPTZ" civicrm api job.execute auth=0


replace CPUSER with the cpanel username , USERNAME with your WP Username, make sure the url is your site's canonical url and set the php timezone (eg America/New_York)

you may have to login via ssh and do a which -a wp to dtermine the path to the wp-cli script.  It's always been /usr/bin/wp for me, but I would double check