I no longer have an iphone and need to downgrade my icloud storage.

Hey,

I no longer have an iphone and I had upgraded my storage last year. I keep getting emails saying I'll be charged again for the storage I don't use anymore. Everything that shows you how to downgrade consists of using the settings on the phone. I'm not sure if there's a way to downgrade without using my phone. I have an ipod but it's old and I don't even use all the GB thats on it. Don't want to be charged to storage I don't use. I don't even have anything saved on to my icloud anymore. Need some help!

Thanks!