Help With Simple Waypoint System

Hey guys I have made a simple waypoint function but I am having a bit of trouble. What I want it to do is this:

locate closest waypoint, go to it, if it reaches it, search again without including the one its currently on.

As you can see in the code below: (distanceToWayPoints[closest] < totalDistance) that block of code has to be changed

 void WayPoint()
 {
     // total distance
     int totalDistance = 10;
     
     // goes through all the waypoints
     for (int nStart = 0; nStart < MaxNoOfWPs; nStart++)
     {
         // calculates all the distances from the monster to each waypoint
         distanceToWayPoints[nStart] = Vector3.Distance(everyWayPointInLevel[nStart].transform.position, transform.position);
         
         // if its the closest waypoint than have it be the target
         if (distanceToWayPoints[nStart] < distanceToWayPoints[closest])
         {
             closest = nStart;
             target = everyWayPointInLevel[closest].transform.position;
 
             //used as temp to know which one was the last wp
             lastWayPoint = everyWayPointInLevel[closest].transform.position;
         }
         
         // if the enemy gets close enough to the waypoint, trigger this = 
         if (distanceToWayPoints[closest] < totalDistance)
         {
             // THIS HAS TO BE CHANGED
             // so that instead of placing the wp at 0,0,0
             // it makes it not calculate the wp in the search
             everyWayPointInLevel[closest].transform.position = new Vector3(0,0,0);

         }
     }
     // animation
     animation.CrossFade("walk");
     // speed
     speed = walkingSpeed;
 }