If you are interested in trying W11 prior to the Oct 5th release, you would have to join Beta channel. This build will become release shortly. Beta is currently 22000.184
Dev channel has already moved on to a future build, which does carry a risk with version 22454 so the only way back to release is a total clean install for at least another year.
You could also download the Beta ISO from here, it most likely be the same when released and do an in-place upgrade to W11. It will run without joining Insider program. as we have been getting Cumulative Updates. Your choice.
https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewiso
As with any major upgrade, it is advisable to do an image backup of your system. I would also save any important files to an external device, flash card, etc. You should have some form of backup routine.