what if I need more storage than 2TB?

I already have 4TB and it is almost full.

I need more than 4TB, I don't understand why Apple don't offers plans of 6TB, 10TB, 20TB and more.

Google One let's you buy more than 10TB, the issue is that live photos are not very compatible with their app.

You can get 4TB by subscribing to both iCloud+ and to Apple One