@SimsinettySim An FX-6300 is still good enough for Sims 4, and that should be true for the entire run of the game, although we of course don't know what future packs will be like. If your motherboard supports it, you could add, for example, an Nvidia 1650 Super, and you'd in all likelihood be able to run Sims 4 on ultra even with all current and future packs together. You could get a quality overclocked 1650 Super for $160:
https://www.amazon.com/dp/B081R359ZM/
If you're not sure what your motherboard supports, please list its exact model, and I'll take a look.
If and when you're ready to get a new computer, you may want to go with a custom build. You'd get to pick the components, which of course is an advantage in that you get exactly what you want and don't need to pay extra for other features you can't use. The other major advantage is that the quality of the components will be higher than in most pre-built systems. In practical terms, that means the hardware should last longer and support a wider variety of upgrades with minimal fuss.
For example, you may decide that now (or whenever you buy) and for the next two or three years, you only want to play Sims games and maybe a couple others that aren't so demanding, but you're thinking that might change at some later date. You could choose components that would support a high-end GPU, and a motherboard that had room for an extra NVMe SSD or faster lanes or the like.
Personally, if it were between ordering the Alienware you listed and getting a custom build, I'd go with the latter. You don't need a 2080 Super for Sims games, not Sims 3 or Sims 4 and probably not Sims 5, or else it would take a couple years of development before any Sims 5 packs would benefit from that much power. But that's at least four or five years out, since from all indications, the base game is at least two years away, if it even ever exists. By that time, all current graphics cards will likely be obsolete, and there will be new ones that are more powerful than anything you could find now. So instead of buying an $800 card, you could buy a $400 card now and get a $500 card in four years that's faster than the $800 card is now.
Also, not that I'm interested in criticizing Alienware, but with a third-gen Ryzen processor, you really want faster memory than 2666 MHz, and there's no reason to have a 2 TB NVMe SSD unless you're compiling code or doing advanced graphic design or video editing or whatever. Point is, you could put together better components for your needs than those.
If you'd like to go the custom route, let me know, and I'll find a good starting point so you can see what your options look like. If you'd rather get a pre-built system, I can look for other options aside from the Alienware, but let me know more or less what you're hoping to get. Still though, you could just get a new GPU (again, if your mainboard supports it) and go for the new system in a couple years.