Autogrind script, I am confused about how to make the values align?

I am having trouble with a script I am making, I tried to make a value called on and whenever you were on an NPC it would toggle so that it would be one at a time...

Is there a way to search for only one at a time and not have to do it individually? Is there a way to toggle this?

My script is so long I had to use pastebin: https://pastebin.com/raw/zV65pT0h

I would give the full script, but that would leak this to the public, if you need the full script to help me DM me on Discord: DanielHasASoftHeart#6520

Some errors I got repetitively were based off of: indexing .Name with nil