Wordpress Ajax problem

Hello I am trying to add a button to my site that will change a value in my database from "0", to "1". The code works fine when I get MY userid but when I try to get the userid of the page I'm looking at it won't get it. I will post my Function, Ajax and Form code.

FUNCTION

add_action( 'wp_ajax_remove_account', 'remove_account' ); function remove_account() { global $wpdb; global $current_user; $user = $current_user->ID; $author = get_queried_object(); $uid = $author->ID; $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->users SET removed = '%d' WHERE ID = '%d'", '1', $uid )); wp_die();
}

AJAX

<script> jQuery(document).ready(function($) {

$('.wordpress-ajax-form2').on('submit', function(e) {
    e.preventDefault();
    var $form = $(this);
    $.post($form.attr('action'), $form.serialize(), function(data) {
    }, 'json');
});

}); </script>

FORM

<form class="wordpress-ajax-form2" method="post" action="<?php echo AJAX_URL; ?>" > <input type="hidden" name="action" value="remove_account" ><br> <center><button id="msgbutton">Remove Account</button></center> </form>

Now if I use the line

$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->users SET removed = '%d' WHERE ID = '%d'", '1', $user ));

it will work fine because it's getting my id, if I use

$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->users SET removed = '%d' WHERE ID = '%d'", '1', $uid ));

it will not work because it will not get the user id. I've been trying to fix this for a while with no luck. I have all my hope in your guys :)