First of all, in my research there is no way to move the worldspawn back to where it first was unless you took note of the cords. Secondly if you want to move the worldspawn you can do so with
/setworldspawn. When ever you set the worldspawn to a location the spawn chunks will be moved with it. Judging by your answer you want the spawn chunks to load command blocks, so all you need to do is go to the command blocks and set the world spawn. In the event that you accidentally did
/spawnpoint (this will set your spawnpoint and not the world spawn point) to remove your spawn point you can sleep in a bed, then destroy it.
Just a note the spawn chunks will only be loaded if someone is in the overworld. (this is applies to single player and I have no idea if the rule is the same on a server.)
If you want to read up more stuff on the spawn chunks you can do so here