How to change positions of characterbody 3d

Godot Version

extends CharacterBody3D

var hasTeleported1 = false
const SPEED = 5.0
const JUMP_VELOCITY = 4.5

Get the gravity from the project settings to be synced with RigidBody nodes.

var gravity = ProjectSettings.get_setting(“physics/3d/default_gravity”)

func _physics_process(delta):
# Add the gravity.
if not is_on_floor():
velocity.y -= gravity * delta

# Handle jump.
if Input.is_action_just_pressed("ui_accept") and is_on_floor():
	velocity.y = JUMP_VELOCITY

# Get the input direction and handle the movement/deceleration.
# As good practice, you should replace UI actions with custom gameplay actions.
var input_dir = Input.get_vector("a", "d", "w", "s")
var direction = (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
if direction:
	velocity.x = direction.x * SPEED
	velocity.z = direction.z * SPEED
else:
	velocity.x = move_toward(velocity.x, 0, SPEED)
	velocity.z = move_toward(velocity.z, 0, SPEED)

move_and_slide()

if coins.coins == 3:
	
	velocity.z = direction.z * SPEED * delta
	position.z = 6
	position = velocity

Question

im tryna to telepot whenever the player picks 3 coins tho it dont teleport.
some guy on reddit telled me to write the two last lines of codes but it dont work someone know how to fix?