// Move render-blocking JavaScript.
add_action( 'wp_enqueue_scripts', 'custom_clean_head', 9999999 );
function custom_clean_head() {
   remove_action('wp_head', 'wp_print_scripts');
   remove_action('wp_head', 'wp_print_head_scripts', 9);
   remove_action('wp_head', 'wp_enqueue_scripts', 1);

   add_action('wp_footer', 'wp_print_scripts', 5);
   add_action('wp_footer', 'wp_print_head_scripts', 5);
   add_action('wp_footer', 'wp_enqueue_scripts', 5);
}

add_action( 'wp_enqueue_scripts', 'my_plugin', 999999999 );
function my_plugin( ) {
    // assigning slug variables
    wp_enqueue_script( $plugin_short_slug, plugins_url() . '/' . $plugin_slug . '/js/' . $plugin_slug . '.min.js', array(), '', false);
}