@lkrause74 If the processor in your computer is supported, and you've either updated the graphics driver or can do so if necessary, then Sims 4 should run fine on your computer after you upgrade to Windows 11. The game does run as expected in 11, most of the time, so there's a good chance you'll be fine.
However, there are a couple of caveats. One is that if you only have 4 GB RAM, you might well notice a performance hit, although it's not guaranteed. Another is of course that 11 is new enough that we can't anticipate all the potential issues, only address them as they show up. And it's clear that systems that 11 doesn't fully support can run into problems that are difficult to address, so definitely don't install it if your processor isn't on the supported list.
In general, it's not always a good idea to update for its own sake. The best approach is often to wait to update until the new software (OS, graphics driver, whatever) has a new feature you want or the old software is out of support or otherwise not working teh way you'd like. For example, I update my graphics driver every six months, more or less, rather than installing each new one at release. It's easy to update your way into a problem that you didn't previously have.
On the other hand, if you really want to try Windows 11, just back up all your files first. That way, if you encounter an issue you can't solve, you can go back to 10.