@Madamelee Tell me what you think of this one:
https://www.bestbuy.ca/en-ca/product/asus-rog-strix-g10dk-gaming-pc-grey-amd-ryzen-5-5600x-512gb-ssd-16gb-ram-geforce-rtx-3060-win-10/15632715
It's overkill for Sims 4, I mean you could run all packs together on ultra graphics settings even on a 4k (3840x2160) monitor, or a QHD (2560x1440) monitor at or close to 144 fps, except of course when the game engine itself is slowing things down. (That can't be helped, it's just how Sims 4 is made.) It's a quality prebuilt system, as good as you're going to see from a standard manufacturer.
If you'd like to save some money, you could get this one:
https://www.bestbuy.ca/en-ca/product/lenovo-legion-tower-5i-gaming-pc-intel-core-i5-10400-1tb-hdd-256gb-ssd-8gb-ram-gtx-1660-super-en/15309485
and pay someone to add extra RAM, which would still be a lot cheaper than getting the one above. It's also more power than Sims 4 needs by a significant margin, just not as large a margin as the Asus.
These are also worth mentioning:
https://www.newegg.ca/abs-ali521/p/N82E16883360126?Item=N82E16883360126
https://www.newegg.ca/abs-ali571/p/N82E16883360206?Item=N82E16883360206
The graphics cards are the same as in the ones above (the faster 3060, the slower 1660 Super), and these both have 16 GB RAM and a 512 GB SSD. The advantage here is that they're more easily upgradable: you could put in anything from extra drives to more fans without any trouble at all. The Asus does have a better processor, although Sims 4 will run perfectly well on the Intel processor as well.
If you don't like these, let me know why, so I can look further. There are many good options for under $2,000, too many to list, so I just picked the overall best ones I found in a short search. But if there are other details that matter to you, please describe them.
I do want to reiterate that ordering a custom-built PC is also an excellent option. The company would build it for you and give you a warranty, plus customer service, and you'd get to pick out the components you wanted. (Or I'd pick out the components for you.) It's more expensive, but you'd still probably come in under $2,000 for the same hardware as above.
I understand you said you didn't want that, but with your budget and preferences, I would be remiss if I didn't mention it again.