Decided to get 16GB more RAM, a Ryzen 5 2600, and a Gen 3 Sabrent Rocket 1TB SSD
What are your actual improvement goals? Based on your post, it seems like gaming is the focus but your purchases don’t really align with that.
Very few games require or benefit from 32GB of RAM. Those that do aren’t going to run well on your current hardware anyways.
The Ryzen 5 2600 is more of a sidegrade from where you are. I would have recommended going for any Ryzen 5000 processor or waiting.
Storage is storage, so do with that what you will.
Starting with GPU would really have been the way to go for gaming improvements, with CPU as a secondary 2 later upgrade. RX6600 / RX7600 could be had new around your budget, shopping used would likely stretch that budget out further.
As far as Windows 11 is concerned, the difference between those CPUs is hardware presence for fTPM 2.0
Windows 11 uses that for Bitlocker, Core Isolation, and (I think) Local Security Authority features.
Windows 11 is otherwise the same as 10 - I’ve yet to encounter anything that worked in 10 but didn’t in 11.
If those features aren’t important to you, you could easily perform an “unsupported” upgrade to Windows 11 and your system would be just as secure and functional as it is now. You would then be able to enable those features when you upgrade the CPU down the line.