Starting with the Windows 10 Anniversary Update (version 1607), Microsoft has reduced the amount of time you can use the rollback feature. Prior to the twice-yearly renewal, there was a 30-day grace period. With the release of the Anniversary Update, Microsoft reduced the rollback grace period to 10 days. Windows 11 may not be a mandatory upgrade at this time either. Whatever the reason, to roll back (RollBack) in Windows 10 case, within 10 days to upgrade to Windows11 is possible as long. Probably due to the design and operation that was not possible at the time of the Windows 10 release, early defects, etc., I ended up reverting to the previous version.
I’ve upgraded to Windows 11, but after using it, I’m sure many users will want to go back because they’re more familiar with the Windows 10 operating system for now.