"iCloud Storage Almost Full" - how do I get rid of this?

Hi!

My settings icon keeps showing a notification. When I open my settings I get the message: "iCloud Storage Almost Full".

Whenever I tap this thing I get a popup about purchasing more iCloud space, but I can't select any option that says 'no thanks'. I don't want to purchase more space.

How do I get rid of this notification? Please don't tell me that I need to clear space for it to go away. There should be another way.