I still do not succeed to upgrade my Icloud storage

Read this support article for instructions on how to upgrade to iCloud+ --> Upgrade to iCloud+ - Apple Support

If you do not see the upgrade you can always check how much iCloud storage you're using in Settings on your device, on a Mac, or on iCloud.com

- On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud.

- macOS Ventura: Choose Apple menu > System Settings, click [your name] at the top of the sidebar, then click iCloud on the right.

- macOS 12 or earlier: Choose Apple menu > System Preferences, click Apple ID, then click iCloud.

- On iCloud.com --> https://iCloud.com

ref: Check your iCloud storage on any device - Apple Support

Manage your iCloud storage - Apple Support

If it still won't show, report the issue to Apple --> Choose your country or region - Official Apple Support Select your country, then a product.

or:

Worldwide iTunes support - Choose your country or region - Official Apple Support