kmohn What happened when you tried to create the symlink? If you're not sure, try again and post the result. I'd like to see the entire Command Prompt window so I can also see the command you used.
Please also list the location of the user folder the game is currently reading, as described here:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
If you see for yourself that the symlink command includes an incorrect file path, and you know how to correct it, go right ahead. But if you'd like me to write out the command for you, just list the current location of the user folder and where you'd like it to be.
Additionally, please do NOT combine the game's program files and the user files. These need to be in separate folders. The same drive is fine, just not exactly the same location.