Postview wont update

Hi,

I have this counter for postviews, using ACF and elementor.

But it wont count+ Its going back to one all the time?

function child_theme_head_script() {
	global $views;
	if (is_singular('post')) {
		$views = (int) get_field('views');
		$views++;
		update_field('count_view',$views);
		echo $views;
	}
}
add_action( 'wp_head', 'child_theme_head_script' );