Hello SwapnamoyKader,
Good day! I'm John 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.
I recommend checking your device for Windows 11 compatibility first using the PC Health Check app
https://aka.ms/GetPCHealthCheckApp
If your device meets and passes all the requirements, I recommend using the Windows 11 Installation assistant to upgrade to Windows 11 manually.
https://www.microsoft.com/en-us/software-downlo...
Note: It's always a good practice to backup your important files first before performing any Windows upgrade or reinstallation.
You can also check and try Sumit’s tutorial guide below on How to Install Windows 11 manually.
https://www.yourwindowsguide.com/2021/10/instal...
**Content on the above blog is written by a Microsoft MVP so it is safe.
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor