the sims 4 progress lost

@Eventenkate

Files of your game aren't kept in the cloud. These files are only into your old computer so you must move these files to this new computer.
How to do this:
You need to pack the "saves" and Tray folders using WinRar program on your old computer. These folders can be found in Documents / Electronic Arts / The Sim4. The Sims4 folder is your game folder.
You can save such packed folders on PenDrive - or send it via e-mail to your own address. You send this e-mail to your e-mail address and attach the packed folders. Because they have a large volume you will need to use Google Drive and have a Gmail email address.
Download these packed folders from Pendrive. or move these packaged from mail to some place on your new computer.
These folders you first unpack and then paste into a new game folder in Documents on your new computer. Of course, before that, you have to delete new folders with the same names that were created there after installation.

I don't work for EA

When I go to the saves folder I can only see one file, which is the empty savegame I think. The tray folder has about 5 files in it. Where do I move these exactly? I only have one saves folder. I mean it can't just get deleted out of nowhere right

The thing is, in my oké pc i had only 1 hard drive so the old saves must be on there. But how do I find those? "Documents" is saved on the new pc and i can find "documents" on the old hard drive

@Eventenkate

Path to this folder :
User/Library/Documents/Electronic Arts /The SIms4 - inside is saves folder

If you have Win10 :
Click on "This PC"
then Click on your C Drive, which looks like this for example -- Acer ( C : ) (Without spaces) --
If you've clicked on it, then you'll see a bunch of folders, Some with program files, etc..
Click on the folder that says 'Users'
then once you've done that, click on the one folder that has your PC's name on it, then click on Documents after the PC's named folder, once you've also done that you'll be directed to some more folders, Click on Electronic Arts then Sims 4

@Eventenkate

Of course, it is as it should be done! Copy and paste this folder into a new game folder. Sorry but I understood that you have a game on another computer and you moved the entire old disk to the new computer.