Need to upgrade to ICloud plus

but it says something went wrong

Check the network connection:

You need to have a good Service and/or Wi-Fi.

If they are On, turn Off Hotspot & VPN.

Charge the battery > 70%.

If you can't connect to the App Store, iTunes Store, or other Apple services

If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

👉 If you tried all of the above steps and you still can’t connect, contact Apple Support.

Then try again:

See this Apple article: Upgrade to iCloud+

Upgrade to iCloud+ - Apple Support

See also: iCloud+ plans and pricing

iCloud+ plans and pricing - Apple Support