Why can't I downgrade my iCloud Plan

See the following Apple Support article for information on downgrading an iCloud storage plan: Downgrade or cancel your iCloud+ plan - Apple Support

If the other instructions there don't help, see the following from that same support article:

Tap Done. If you can't tap Done, make sure that you're signed in with the same Apple ID that you use for your iCloud+ plan. You can also try following these steps on a different device. If you still need help, contact Apple Support.

If you downgrade or cancel your iCloud+ plan, the change takes effect after your current subscription billing period ends.1

See the following from my previous reply:

Tap Done. If you can't tap Done, make sure that you're signed in with the same Apple ID that you use for your iCloud+ plan. You can also try following these steps on a different device. If you still need help, contact Apple Support.

Yes, I understand you want to downgrade, I understand you cannot downgrade, but what you have so far not told us is what happens when you try to downgrade exactly.

robertjblk23 wrote:

...I can't go into my system and tell it to degrade or downgrade to $.99 a month instead of $2.99 a month.

Why can't you go into your system and tell it to downgrade? What happens when you try? Have you followed the steps in the support document linked to by Foxfifth above? click here ➜ Downgrade or cancel your iCloud+ plan - Apple Support

If you have followed those steps, where exactly are you getting stuck?

We can't actually help you, if you don't explain what happens.

No way for us to know.

Who you like to tell us what happens when you try to downgrade?

Do you get an error? If so, what does it say?

Are you trying to downgrade to a lower paid tier? Or to the free 5GB option?

Please explain clearly and in a s much detail as possible what happens when you try to downgrade, and how you are trying to downgrade exactly.