Hi, I'm Robinson, and I’m happy to help you today.
I know how frustrating this may be for you but I'll do my very best to help you.
The Media Creation Tool always downloads the latest Windows ISO. If you don't have a specific reason to need the Windows version 21H1 you can use the Media Creation Tool to perform the repair upgrade and update to the latest version of Windows without the need to create a USB bootable.
1-Download the media creation tool.
https://go.microsoft.com/fwlink/?LinkId=691209
2-Run the tool and select 'Upgrade this pc now'
3-Select the option 'Keep all my files and apps'
4-Then click to update.
This procedure will repair all Windows files and apps.
If you need the specific version 21H1 you can use this site to download the ISO 21H1.
[link removed - download site not permitted]
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products).