Hello,
If your system has issues, Windows Update will automatically offer you the repair version of Windows 11.
If you would like to manually do the same thing the repair version of Windows, you can download the Windows 11 ISO from https://microsoft.com/software-download/windows11 and then double-click the ISO once it finishes downloading.
When Windows Setup opens, go through the steps it prompts you, and then at the "Ready to install" menu, make sure that "Keep apps and files" is selected. If it isn't, click "Change what to keep" and then choose the option to keep everything.
Before you start, if you have a laptop, make sure it's plugged in so that it doesn't die halfway through. This will take a little bit so make sure you're not doing anything important during these times and to also save any work that you may have open.
Let me know how this goes.