My iCloud not show contacts

Device or computer?

Computer

Try going to System Preferences/iCloud (Apple ID for Catalina or later) and stop Contacts syncing by unchecking the box. Wait a couple of minutes, then check syncing. Allow time for the sync to complete.

Last resort  - have you tried signing out of iCloud, restarting, and then signing back in?

See the Apple Support article below. 

Contacts, Calendars, or Reminders - Get help using iCloud.     

Device

Try Settings/Your Name/iCloud and slide off Contacts syncing. Wait a few minutes and then slide syncing on. Allow time for syncing to occur.  

Last resort - have you tried signing out of iCloud, restarting the device, and then signing back in?

See the Apple Support article below. 

Contacts, Calendars, or Reminders - Get help using iCloud.