As this is a web hosting service, just using a domain for DNS and email service, could be considered misuse of the service.
Free subdomains are not compatible with Cloudflare
Did you follow the instructions the admin posted? You only get 24 hours after it was suspended or it gets suspended again.
https://community.x10hosting.com/threads/requesting-unsuspension.216503/
Please follow unsuspension request guidelines
https://community.x10hosting.com/threads/this-board-is-for-all-unsuspension-request.209292/
The unsuspension reason is directly stated when clicking on the service name.
Please follow unsuspension request guidelines
https://community.x10hosting.com/threads/this-board-is-for-all-unsuspension-request.209292/
Suspension reason is listed on the account panel.