Site:mywebsite HP not first

When I type site:https://l.facebook.com/l.php?u=http%3A%2F%2Fmywebsite.com%2F&h=ATPNHFqnCyjMojF-RlABzS4kC6mAUmcro7kIztP4VOxsJIkkRjFRWQBEvgw1XfNcV0LjJl_qIpW9HF1wPpOWNsA-DP9T6fG-P7AHy0H--ADCqTJUGio07t68XSYYiZZlWdhSsgFnh5ftVQLG8vxoxyFqeVXNtvNuPt2FKdEKcGTUF6CNRVL2K1yBbNAc2E7p1bg-JaHgneieAZTU0qyYrC5e6jLdoHzb9jGeFJBluvv20VYReTqC9ZObf-UC3EwtZbYPFulpWcdU9bgkbONIMjPRqUjv2Q in Google, the HP of my website doesn't appear first but 8th in the SERP. Do you have any idea what kind of problem my site may have ? Thank you

When I type site:mywebsite in Google, the HP of my website doesn't appear first but 8th in the SERP. Do you have any idea what kind of problem my site may have ? Thank you

Sorry wrong copy/paste on the original post