I can't cancel my subscription

The absence of the cancel button and the presence of the statement that it will expire soon both indicate that it is already cancelled.

If the option to cancel a subscription is missing, see the following excerpt from Apple Support article If you want to cancel a subscription from Apple - Apple Support

You might need to scroll down to find the Cancel Subscription button. If there is no Cancel button or you see an expiration message in red text, the subscription is already canceled.

Also, a subscription that is already cancelled will typically have wording in fine print similar to "Expires on [date]" rather than "Renews on [date].”

You've already cancelled automatic renewal. If you can't wait for it to expire, click here and ask the iTunes Store staff for assistance.

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That means it is already cancelled. It will not renew.