Microsoft does not force users to install Windows 11, even if their computer fully supports it. However, it is recommended to update to Windows 11 to ensure your computer is fully updated and supported.
For computers that cannot upgrade to Windows 11 due to hardware limitations, Microsoft offers Extended Security Updates (ESU) for Windows 10. This program provides critical and important security updates for systems that are otherwise unsupported. While ESU is primarily designed for businesses and organizations, recent developments suggest it may become available to individual users as well.
You can find more details about ESU here:
https://learn.microsoft.com/en-us/lifecycle/faq...
Also, Microsoft has shared insights on preparing for the Windows 10 end-of-support transition:
https://blogs.windows.com/windowsexperience/202...
Please feel free to ask if you have more questions.