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Use your calendar to make a note of when to cancel subscriptions that start off as free. Usually if you cancel them you can still use them up to the end of the free period. Set up a reminder on your phone or there's the old timeless way of using the calendar on your fridge.
Write a list of everything you are being charged for and see if you can cancel some of them. There may be many you no longer use. Note: you will still be charged up until the end of that billing period.
Also many apps use up your phone data which in turn can cost you more. Review apps and remove those you no longer use.