@immunetree2 I can't see the photo of the PSU, because the virus scanner is still not letting anything through, but if it's the one that came with the Dell, that's enough.
On the download page for your system, Dell offers a newer BIOS than you have and has marked it as urgent. So if you're comfortable updating it, that's a good place to start. It looks like the update is to address security issues, not anything that would explain the computer freezes, but there might be some other useful feature that isn't listed.
https://www.dell.com/support/home/en-us/product-support/product/xps-8900-desktop/drivers
Your other drivers are all the recommended versions or newer ones, and there's no indication that any of them is an issue. You may want to update the Nvidia graphics driver though, since it's older than your Windows 10 build.
https://www.nvidia.com/Download/driverResults.aspx/163531/en-us
Most of the crashes listed in your dxdiag are from Origin's update tool, and the others are from Dell's update tool. For the Dell tool, you can try uninstalling the Dell Digital Delivery Application and installing the version offered for your computer. That one is slightly older, hence the need to uninstall the current version, but it should update itself if necessary, and in the meantime you've removed an install that's potentially corrupt. For Origin, you may as well clear its cache, uninstall it "the hard way," and reinstall.
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/
It's possible that none of this will address the crashes though. In your position, the best approach may be to log some hardware info and wait for another crash. If you'd like to do this, download hwinfo from here:
https://www.hwinfo.com/download/
You don't need to install anything if you don't want to; just choose the Portable version, unzip it, and launch it from Downloads or wherever you want. (If you would like to install, be sure to click the green button, not the orange one.) When you're ready to play, launch hwinfo, choose "sensors only," and click the icon that's a sheet of paper with a + sign to start logging. Save the file to your desktop for easy access later.
Wait five minutes before launching Sims 4, and play normally. If you don't get a crash, you can click the same icon to end logging, and just delete the log. (Or upload it if you want, and I'll take a look, but there might not be anything useful to see.) If you do get a crash, the log should be intact up to that point. Please upload it to a third-party free filehosting site and link it here; leave it in .csv format, or if you use OneDrive to share, please compress it in .zip format instead.
