If all conditions are met, simply finish the in-game day by tapping the "Wait" button to sync your progress to the cloud.
To download your cloud data on a new device or after reinstalling the game:
If your progress does not restore, it was not saved correctly. When transferring progress between devices, ensure the first device meets all requirements and finish the in-game day there first. If you cannot do this, the data cannot be recovered.
If you want to take a temporary break, use the "Offload App" feature instead of deleting the game (Settings > General > iPhone Storage > Retro Garage - Car Mechanic). This frees up device storage while keeping your save data safe. Your progress will restore when you redownload the game.

Cloud data deletion is not currently supported for the App Store.