The LTSC edition of Windows adopts a lean, more stable approach. Windows 11 LTSC is now available with the third-version update, aka 24H2. However, it still maintains the simplistic design ...
Mainstream end of support for Windows 10 21H2 LTSC is 2027-01-12. But the process to switch is not particularly easy nor is it free. You need a Windows 10 LTSC license.