I have been trying to sign in to my iCloud but they always say could not communicate with the server

If you can't connect or sign in to iCloud or your account, Apple has a list of things you can try in the document If you can't connect or sign in to iCloud - Apple Support

Is the iCloud server working? --> Apple - Support - System Status

If you are using a VPN, try turning it off and see if you can then log in. E.g., AppStore - Apple Community

If an item is greyed out or restricted, see this support article —> Use Screen Time on your iPhone or iPad - Apple Support

For more assistance try the iCloud Support web site --> iCloud - Official Apple Support

If you still have problems try official Apple Support. Click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> Contact Apple for support and service - Apple Support

VPN prevented sign-in --> Update - Apple Community

What should I do

Cloud not communicate with the sever