to cancel subscription

Only if you have a Teams subscription:

Do you have a teams trial? You should be able to cancel via the admin console: https://adminconsole.adobe.com/. If that is not possible, contact your reseller or contact Adobe support: https://adminconsole.adobe.com/support.

Only if you have an individual subscription:

If you have an individual trial, you can self cancel. Look here for more information: https://helpx.adobe.com/manage-account/using/cancel-subscription.html.

If you can't self-cancel, you should contact Adobe customer care: Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled! If the chat window fails to open, or is non-responsive, use a different device to start the interaction.
Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.

(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)