Windows 10: Need Help Upgrading from Version 1909 OS Build 18363.1556 to 21H2

I haven't been able to update Windows for probably nearly two years now. Things I've triedISM, SFC, net stop & start the usual tip you getDisabling antivirusRestarting Windows Update serviceunplugging all peripheralsUsing DriverFix to install updated drivers some Intel ones wouldn't download for some reasonDoing a clean bootWindows Media Creation toolUpdate AssistantWindows Update from settingsIn-place upgradeError messages I've gotten from the last update attempt through Windows Update from settings:0xc1900101 from Windows Update in settings... from past attempts at updates I believ

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Your device is missing important security and quality fixes.

version 1909 OS build 18363 1556

 

Update Windows 10 version 1909 to version 21H2

Can I Update Windows 10 version 1909 to version 21H2 (latest)?

Then Please send the useful steps to do that...

By changing windows version 1909 to 21H2 does it removes all files(music, videos, software,etc.) present in my laptop or it is safe, nothing will be deleted.

Now I am not getting critical updates for windows version 1909.

Please anybody give suggestion regarding this matter.

 

Windows 10 Full Update 1909, 18363.657 Build 18363

Received notice, on my computer, that I needed to take the free update to windows 10 before my current version expired.

I updated, the whole OS on 02/23/2020. Specs:= 1909, 18363.657, Build 18363. I now CANNOT change my default browser identification. Microsoft Edge is set as default, surprise, and I can't seem to change it to anything else, e.g. Firefox

Suggestions???

Joe B...............