MaireadDeevy I like the build you've put together, and the only thing I'd upgrade is the graphics card, IF your budget could accommodate it. But the rest of the build would support a faster GPU later too, so you could upgrade in a year or two rather than now. And Sims 4 doesn't strictly need anything faster than a desktop RTX 3050; this would more be for other games, or for adding ReShade or something else that makes Sims 4 more demanding.
This RTX 3060 is in stock and only marginally more expensive than the 3050 you've picked out:
And this RTX 5060 is only a bit more than that:
As for saving money, you could go with a high-end tower cooler rather than liquid cooling for the CPU, which won't generate that much heat. DeepCool isn't a great brand for liquid cooling, although it shouldn't matter for this particular CPU.
And you don't need a 2 TB SSD, so yes, you could save a lot of money there. If Sims 4 is the only significant source of data you'll store on this computer, even 512 GB would likely be fine, so one terabyte should be more than sufficient even if you never delete your old saves.
