Hello Nijat,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Please check the support article below on How to improve PC performance in Windows 11 if it helps.
https://support.microsoft.com/en-us/windows/tip...
If this does not work, You can check and try Kapil Arya's tutorial guide below on How to Downgrade from Windows 11 to Windows 10.
https://answers.microsoft.com/en-us/windows/for...
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor