@SmiliGirl32 I apologize for the delay. I got caught up trying to figure out some details about memory (more on that later), and it took a while to sort through the data.
Anyway, I put together a system, or rather most of a system, that costs $1,415 U.S., not including taxes. I'm not sure what the duty and other fees would be, but maybe you'll be able to figure it out once you're looking at the site.
http://www.cyberpowerpc.com/saved/1MGBV9
This is just a starting point, to get you oriented. The components:
Motherboard: an MSI X570A-Pro
Processor: an AMD Ryzen 9 3900, an extremely strong CPU that should last you through at least one upgrade cycle
CPU cooler: 360mm-radiator liquid cooling, so you don't have to worry about it
Memory: see below
Graphics card: an Nvidia 2060 Super, which can run Sims 4 at a 2560x1440 resolution at or above 144 fps under ideal conditions, although the game itself has unavoidable fps drops
Storage: a 1 TB NVMe SSD, the fastest kind
Power supply: a Corsair 750W Gold PSU, because you don't mess around with the power supply
The graphics card is kind of the weak link here, if there is one, but it should always run Sims 4 at well over 100 fps, aside from the times the game decides to be difficult. (There's not much any graphics card can do about that, although a faster one always helps.) This is the component you might want to upgrade in four years, but you'd be able to do so without replacing any other components. There's also room to add any kind of hard drive if you decide you need more storage later, although 1 TB should be more than enough for all your video editing.
The one thing this computer might not have, at least not in this particular configuraton, is all the memory you'd want, at least ideally. 16 GB RAM is more than enough for Sims 4, and it's enough to do regular video editing; there's a free upgrade from 8 to 16 GB "today only!!!" (i.e. probably twice a week). But if you want 32 GB, it would be cheaper to get 16 GB (or 8 if you don't catch the sale) and upgrade it yourself. Cyberpower charges almost $300 CAD to go from the default 8 GB 3000 MHz RAM to 32 GB 3200 MHz RAM, whereas you could get your own 2x16 GB kit, guaranteed compatible with the motherboard, for $175, and sell the memory the computer came with if you want.
https://www.amazon.ca/dp/B016ORTNI2
But this depends on your preferences, and of course you could swap out the RAM whenever you chose. It's the easiest upgrade to perform on a computer: memory clicks into an easily accessible slot, and as long as you place the modules in the appropriate slots (always read the motherboard manual), there shouldn't be any issues. You'd also need to be careful to get compatible RAM for your motherboard, but it's easy to cross-check the product number with the support page for the board.
Anyway, this is at least a starting point, so you can think about what you'd get for your budget, and whether you want to change any of the components. Feel free to ask more questions too.