Once you can cancel a free trial you cannot start it again.
If you want to cancel a subscription from Apple - Apple Support
- "If you cancel during a free trial period, you might lose access to the subscription immediately."
The people on this forum do not work for Apple. If you wish to ask Apple:
Refer to this page for Apple Support features ➔ Contact - Official Apple Support
Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.
This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple Support - Apple Support For some countries look under “Other” listing at the end of each region. Not every country has telephone support.
Comunidades de soporte de Apple en español -
Comunidad de soporte de Apple oficial