I’m totally not ripping this idea off of the Minecraft LOTR mod. 
I keep seeing people complain that their followers don’t attack the target they want or that they wont attack at all until you get hit. (tip: Don’t shoot the guy you want them to attack, shoot the guy next to him).
A simple fix for this would be to make a command item that you can use to target an enemy and get your followers butt moving. Basically “The Sword Of Command” from this mod here: https://lotrminecraftmod.fandom.com/wiki/Sword_of_Command