Try resetting the installation folder for Sims 4.
To do this, go to Origin and click Application Settings, select the Installs and Saves tab and re-select the location to install the game to.
For example: Install Sims 4 to: C:\Program Files (x86)\Origin Game
This should help Origin reset the download and see any new updates or content ready to download and install.
If that doesn't work, you might try uninstalling/reinstalling Origin.
https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/
You won't loose any Sims 4 files, as they are installed in different folders. If you are concerned about this copy the Sims 4 folder to a USB key.