Looping NPC move between 4 points ?

I tired to make the NPC move between 4 points but he only move between point A and point B and he stuck at point B , i put the NPC out of point B but after the delay time , he still move to point B then stuck there again. Please help, here the script :

local delay_time = 3

local NPC = game.Workspace.Noob local humanoid = NPC.Humanoid

local pointA = game.Workspace.A

local pointB = game.Workspace.B

local pointC = game.Workspace.C

local pointD = game.Workspace.D

local nextTarget = pointA

while wait(delay_time) do

humanoid:MoveTo(nextTarget.Position)


humanoid.MoveToFinished:Wait()


if nextTarget==pointA then
	nextTarget=pointB
	
end
if nextTarget ==pointB then
	nextTarget=pointC
end
if nextTarget ==pointC then
	nextTarget=pointD
end
if nextTarget==pointD then
	nextTarget=pointA
end

end

My code start from the first "local" but AI only started realize it from "humanoid" weird :/ AND also I put this in regular script in the NPC