Windows Update Fails to Install or Gets Stuck on Windows 11

It seems you're on Version 23H2, and it reached end of updates:

https://learn.microsoft.com/en-us/windows/release-health/windows11-release-information#windows-11-current-versions-by-servicing-option

I highly recommend to upgrade to current version i.e. 25H2:

You can try manual upgrade using Windows 11 25H2 ISO file.

Follow these steps: 

Download Windows 11 25H2 ISO from the official Microsoft website.

Double click on it to mount it to a DVD drive.

Then go to DVD drive, double click on setup.exe to proceed.

Follow on-screen instructions to complete upgrade.

For detailed instructions, refer this step-by-step guide:

https://www.kapilarya.com/how-to-upgrade-to-windows-11-version-25h2#method-3-upgrade-to-windows-11-25h2-using-iso-file

Let us know if this helps!

Note: Included link in this reply refers to blog by a trusted Microsoft MVP.