Some thoughts:
What is of interest to you with windows 11?
The benefit as I see it comes from the better scheduler for alder lake big/little cores.
Windows 11 is bound to have some bugs, I would delay if I could.
I think you can probably run windows 11, but with some of the new security changes disabled.
Going off support does not mean that your pc will stop running.
It just means that new features for windows 10 will not be available past 2025.
You should still be getting security updates.
Pcie x2/3/4 made little difference for graphics card performance.
For performance, you do want a ssd. But, do not be too much impressed with the synthetic benchmarks that come with pcie 4.
In actuality, once you have a ssd, ANY ssd, you will...