Jasmine_Minerva What do you think of this one?
https://www.officeworks.com.au/shop/officeworks/p/lenovo-15-6-loq-essential-gaming-laptop-i5-16-512gb-rtx-5050-lenc0039au
Its graphics card is an upgrade over the RTX 4050 in your current laptop. It does only have 16 GB RAM and 512 GB storage, but the memory looks to be upgradable, and you don't need more than 16 GB for Sims 4 anyway. You could also get an even faster GPU for your budget, and double the storeage, even though you don't need either and wouldn't see any benefit in Sims 4:
https://www.officeworks.com.au/shop/officeworks/p/lenovo-15-6-loq-essential-gaming-laptop-i5-16-1tb-rtx-5060-lenc0038au
This is an alternative with an RTX 4050, so not an upgrade but still good enough for Sims 4:
https://www.hp.com/au-en/shop/victus-gaming-laptop-15-fb3088ax-bt0m7pa.html
The same model but with an Intel processor is $100 cheaper, but there are a number of players who've repoted white/black screens when launching the game. There are workarounds for that that work for almost everyone, if you'd like to save the money. However, I'd avoid that since some of the workarounds are inconvenient at best, and the model with an AMD CPU is still within your budget. Also, the RAM is faster in this one since it's DDR5.
This is another option, not an upgrade and at the top of your price range, so I would think the LOQ is a better option unless you don't like it for one reason or another. It does however have 1 TB of storage.
https://www.umart.com.au/product/gigabyte-g6-mf-16in-wuxga-165hz-i7-13620h-rtx-4050-1tb-ssd-16gb-ram-w11h-gaming-laptop-g6-mf-h2au854kh-76624
Aside from that, the only options I'm seeing that are NOT a downgrade in terms of performance, and are not from Acer, are a couple MSI models, this one being the cheapest and fastest:
https://www.umart.com.au/product/msi-thin-a15-b7vf-15-6in-fhd-144hz-r5-7535hs-rtx-4060-512gb-ssd-16gb-ram-w11h-gaming-laptop-thin-a15-b7vf-041au-77056
This particular model runs hot and noisy, in case that's an issue for you. I don't generally recommend these for exactly that reason, but maybe you already have a setup where that doesn't matter (good headphones, cooling fan or pad, or something along those lines).
Gaming laptops in this category generally only have a 500 GB drive, and all of them have 16 GB memory unless they've been upgraded by a third party. Some professional-tier laptops with gaming-tier hardware do have more RAM and storage, but they're typically somewhat more expensive without any performance gain. Still, if you'd like me to look for something with different specs, feel free to ask.