With the risk of sounding snarky, there are other components.So how can I reduce the size of the iso without getting the above error?
As stated above, try the Templates in the Components page toolbar for a quick start.
Then keep on removing things that you don't need.
Btw if you want to remove deep removals (WinSxS cleanup), disable Components - toolbar - Compatibility - Servicing Stack compatibility.
But know that then updating is only possible via Host Refresh or a reinstall.