KKIMZY One issue is obvious: your computer's C drive is critically low on space, and the page file (which is assigned from the system drive) is almost all used as well. It does look like you have a lot of background apps running, so try to shut down whatever you're not using, and if these apps are set to start with Windows, disable them in the Task Manager's Startup section. This doesn't prevent them from working; it just means they won't open on their own when you reboot your computer.
But the critical part here is to clear as much space as you can on C. Try for at least 30 GB free, so 22 more than you have now, because your computer will likely increase the page file size when it can and eat into the margin you build. Luckily, your external drive has plenty of free space.
If you need to move any Sims 4 data to the external, this guide can help:
📓[GUIDE] [PC] Choosing where Sims 4 data is stored | EA Forums - 12598500
You don't necessarily need to move everything, so choose what works for you.
In case you're wondering, the page file is where the processor stores data that would normally be in RAM but doesn't fit. Since your laptop only has 8 GB memory, the page file will get used a lot when you're playing Sims 4 or just multitasking. The system increases the page file as necessary, but only so far as the system drive can provide the extra space.