You can try Clean Boot, which starts Windows with a minimal set of drivers and startup programs, so that you can eliminate third-party software to determine if your system is experiencing any anomalies. You can refer to the following link on how to do a clean boot.
How to perform a clean boot in Windows - Microsoft Support
Disclaimer: Clean Boot starts Windows with a minimal set of drivers and startup programs, which helps determine if background services are interfering with your game or program and isolates the cause of the problem.
If your memory usage is still abnormally high after a clean boot, you may have a problem with your system. In this case, the best option for you is to upgrade in-place. The principle of in-place upgrade is to upgrade your system from the old version to the latest version by overwriting only the system files while preserving the original system and user data, thus restoring the normal use of your system. How to upgrade in place, you can refer to the following link.
How to run In-place upgrade in Windows 11 - Microsoft Community
Best regards
Brian