You can get the MS ISO of the Win 10 LTSC from the official website.

To activate. https://massgrave.dev/

LTSC has an amazing amount already removed this is my goto for the rest

Open PowerShell as Administrator. ​Run: iwr -useb https://christitus.com/win | iex ​Navigate to the Tweaks tab and apply the Essential Tweaks profile to safely disable residual telemetry and scheduled tasks.

Sycnex Windows10Debloater for any remaining tweaks.