Reset game without losing packs?

@oomilee 

First your packs are available thru Origin as long as they are bought and/or registered there.
You should not have to delete or uninstall those from your computer.
To simply reset your game folder please follow the steps below:
Go to Documents\Electronic Arts\The Sims 4 to find your saves etc.
You can delete that folder (The Sims 4) as long as there are no saves or screenshots you want to save..
Run Repair from Origin as described in the troubleshooting guide.
The repair function will refresh the packs installed.
Start the game.
The game will automatically create fresh versions of all the folders/files.
Viola! You now have a fresh start.

Troubleshooting tips
https://answers.ea.com/t5/Technical-Issues-PC/READ-FIRST-Troubleshooting-your-Game/m-p/3621199