I want to remove some subscriptions on my device?

See this article.

How to cancel a subscription from Apple

If you are referring to expired subscriptions then...

This cannot be removed by an individual. It will get removed on its own based on the subscription period you enjoyed in the past and the future re-subscribe option available for you by the app developer.

It will get removed automatically once it fulfils all the criteria conditions set by the app developer.

Settings > [Your Name] > Subscriptions > [remove subscription]

That’s for completely unsubscribing from a subscription and deleting it from your Apple ID.