Hello I need more storage in my I cloud

- Go to Settings > [your name] > iCloud > -- Manage Storage or iCloud Storage.

- Tap Buy More Storage or Change Storage Plan.

- Choose a plan.

- Tap Buy and follow the onscreen instructions.

https://support.apple.com/en-in/HT201318?

See

Upgrade your iCloud storage plan

https://support.apple.com/en-us/HT201318