Calling a php function from a wordpress site

I'm trying to create a link/button inside a wordpress site which starts a plugin if you click on it (in my case it should make a cookie banner appear). I'm completely new to this so I'm not 100% sure which function actually starts the cookie banner but i assume it's function func_wp_vue()inside the main.php. The main.php looks like this:

<?php
    function func_load_vuescripts() {
        wp_register_script('wp_js', plugin_dir_url( __FILE__ ).'dist/js/app.js', [], '1.0.0', true);
        wp_register_script('wp_js1', plugin_dir_url( __FILE__ ).'dist/js/chunk-vendors.js', true);
        wp_register_style('wp_css', plugin_dir_url( __FILE__ ).'dist/css/app.css', true);
        wp_register_style('wp_css1', plugin_dir_url( __FILE__ ).'dist/css/chunk-vendors.css', true);
    }
    add_action('wp_enqueue_scripts', 'func_load_vuescripts');

    function func_wp_vue(){
        wp_enqueue_script('wp_js');
        wp_enqueue_script('wp_js1');
        wp_enqueue_style('wp_css');
        wp_enqueue_style('wp_css1');

        $str =  "<div id='app'>"
                .""
                ."</div>";
        return $str;
    }
    add_shortcode( 'cookie', 'func_wp_vue' ); 

The plugin is uploaded and loads on the site but i would like to manually activate the cookie banner again if i click on the link/button. I tried to implement it with<p><a href="wp-content/plugins/cookie/main.php">Click me</a></p> into the wordpress site but just get this error:

Fatal error: Uncaught Error: Call to undefined function add_action() in /home/www/wordpress-cookie/wp-content/plugins/cookie/main.php:16 Stack trace: #0 {main} thrown in /home/www/wordpress-cookie/wp-content/plugins/cookie/main.php on line 16

Any help is appreciated!