Multiple random walkers moving up or down

mySketch
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circleArray = []
const step = 3
let direction1 = 'downright'
let direction2 = 'downleft'
​
function setup() {
  createCanvas(600, 600);
  background('grey');
  frameRate(20)
  colours = [
    "#fe4365",
    "#fc9d9a",
    "#f9cdad",
    "#c8c8a9",
    "#83af9b"
  ]
  
​
​
  for (let i = 0; i < 1000; i++) {
    let c = {
      x: random(0, 600),
      y: random(0, 600),
      colour: random(colours)
      
    }
    circleArray.push(c)
  }
}
​
function draw() {
  drawMultipleWalkers()
  moveMultipleWalkerLeft()
​
  //if frame count is a multiple of 30
  //  change direction
​
  if ((frameCount % 10) === 0) {
    changeDirectionLeft()
  }
  
  
​
}
​
function drawMultipleWalkers() {
  for (let c of circleArray) {
​
    circle(c.x, c.y, 10);
    fill(c.colour);
    // noStroke();
  }
}
​
function mousePressed() {
  changeDirectionRight()
}
​
function changeDirectionRight() {
  if (direction1 === 'downright') {
    direction1 = 'upright'
  } else {
    direction1 = 'downright'
  }
}
​
function changeDirectionLeft() {
  if (direction2 === 'downleft') {
    direction2 = 'upleft'
  } else {
    direction2 = 'downleft'
  }
}
​
function moveMultipleWalkerRight() {
  for (let c of circleArray) {
    if (direction1 === 'downright') {
      c.x += step
      c.y += step
    } else {
      c.x += step
      c.y += -step
    }
  }
}
​
function moveMultipleWalkerLeft() {
  for (let c of circleArray) {
    if (direction2 === 'downleft') {
      c.x += -step
      c.y += step
    } else {
      c.x += -step
      c.y += -step
    }
  }
}
​
​
// function moveMultipleWalker() {
//  for (let c of circleArray) {
//    if (c.x > 600 || c.y < 0) {
//      c.x = random(0, 600)
//      c.y = random(0, 600)
//    } else {
//      c.x += step
//      c.y += -step
//    }
​
//    // c.x += random(-step, step)
//    // c.y += random(-step, step)
//  }
​
// }
​
// make direction that goes right or down
​
​
// frame count 
​
// for the first five frames go up
​
// for the next five go down
​
// or 
// variable that represents the direction, right or down, boolean
​
// move all the circles according to the direction 