How to create a zig zag effect?

I'm making a harry potter wand module and basically I want it to go in a zigzag path, instead of a straight line https://gyazo.com/0ecb8202f4121e86416f9424c754d718. This is my current script

local SpellPart = script.Assets.Projectile:Clone()
    SpellPart.Anchored = true
    SpellPart.Parent = game.Workspace.Spells
    SpellPart.Position = Char.Wand.Effect.Position
    SpellPart.CanCollide = false
    SpellPart.CFrame = CFrame.new(SpellPart.Position,Char.MouseTarget.Value)
    SpellPart.Trails.BaseTrail.Enabled = true
    SpellPart.Trails.BaseTrail.Color = ColorSequence.new(Properties.Color)
        SpellPart.Trails.OuterTrail.Enabled = true
    SpellPart.Trails.OuterTrail.Color = ColorSequence.new(Properties.Color)
    local IgnoreList = {Char,SpellPart,Char.Wand.Effect,Char.Wand.Handle}
    local SpellSpeed = Properties.Speed/15
    Spell = nil --DISABLE SPELL

for Movement = 1, math.huge do 
     if not SpellPart then break end
         wait()

  local SpellRay = Ray.new(SpellPart.Position, SpellPart.CFrame.LookVector * SpellSpeed)
  local hit,hitpos,hitnormal = workspace:FindPartOnRayWithIgnoreList(SpellRay, IgnoreList,false,true)
if not hit then
        SpellPart.CFrame = SpellPart.CFrame + SpellPart.CFrame.LookVector * SpellSpeed

  else

    SpellPart:Destroy()

    break

  end
end

end
end

I tried changing the

if not hit then
SpellPart.CFrame = SpellPart.CFrame + SpellPart.CFrame.LookVector * SpellSpeed

to

if not hit then
SpellPart.CFrame = SpellPart.CFrame + SpellPart.CFrame.LookVector * SpellSpeed
SpellPart.CFrame = SpellPart.CFrame + Vector3.new(math.random(-1,1),math.random(-1,1),math.random(-1,1)

But it ended up not hitting at the right spot. Any ideas what I can do?