LTSC: What is it, and when should it be used?

I wanted to try LTSC just to see if it would be more usable for me than "2004"/20H2. So I installed it into my Mac Pro Bootcamp partition in early summer this year. I am kind of dismayed by the lack of updates for what to me, appears to be a superior version of Windows 10. One without the "Windows Store", if I want to run it that way. Actually, I found a script that added the store back in, so I can use most of my paid store apps. But no "Cortana", I think the update for Cortana in 2004 was excellent, much more friendly.  In my situation, I use Windows to drive workstations for Audio and Video editing, so I don't want a lot of excess junk gobbling up resources. Because I need every byte of memory available and I need to keep my system drive lean, as sometimes I am limited to 500GB partitions.

I still have LTSC installed, but it has not updated to much newer than 17663.1554. At some point, I may want to officially get this build, it is so much better for me. My question is, how exactly do I do that? And, are there any major updates coming down the pipe, I had read that one was coming in Fall 2020. I can't remember the source for that though.