Wordpress woocommerce multiple orderby args loop - php

Question

Does anyone know how to incorporate a while loop into a basic order by filter? I have the following basic filter in my functions.php page that orders my products by the featured products and it works:
add_filter('woocommerce_get_catalog_ordering_args', 'am_woocommerce_catalog_orderby');
function am_woocommerce_catalog_orderby( $args ) {
if(!$_GET['orderby']) {
$args = array(
'orderby' => array( 'meta_value' => 'DESC' ),
'meta_key' => '_featured'
);
return $args;
}
}
My problem is I want to use some more advanced while loops to try and get multiple different arguments tied into the same args. I am trying to show my featured products first, then load that into an array then get my next loop and only show the products that are 6 months old or younger and add that to my array, then show everything else and sort them by menu_order and title and add it to my array as shown below:
add_filter('woocommerce_get_catalog_ordering_args', 'am_woocommerce_catalog_orderby');
function am_woocommerce_catalog_orderby( $my_post_array ) {
if(!$_GET['orderby']) {
//First loop - show featured
$args['orderby'] = array( 'meta_value' => 'DESC' );
$args['meta_key'] = '_featured';
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
$post_id = get_the_ID();
$my_post = my_post_function($post_id);
//Store the items in an array
$my_post_array [] = $my_post;
query_posts($args);
endwhile;
wp_reset_query();
//Second loop - Show newer than 6 months
$args = array(
'orderby' => 'date',
'order' => 'DESC',
'date_query' => array(
array(
'before' => '6 months ago',
),
)
);
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
$post_id = get_the_ID();
$my_post = my_post_function($post_id);
//Store the items in an array
$my_post_array [] = $my_post;
query_posts($args);
endwhile;
wp_reset_query();
//Third loop - show everything else and sort by menu_order and title
$args['orderby'] = array( 'menu_order' => 'ASC', 'title' => 'ASC' );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
$post_id = get_the_ID();
$my_post = my_post_function($post_id);
//Store the items in an array
$my_post_array [] = $my_post;
query_posts($args);
endwhile;
wp_reset_query();
//Remove duplicate entries from the array
array_unique ( $my_post_array, SORT_STRING );
}
}
Then the last thing I do is remove my duplicates. Only problem is it does not work and I am not sure where I am going wrong, I have not done something like this before so I could be working in the wrong area or missing something obvious. Anyone have ideas on how I can trouble shoot this or does anyone see something that may be causing me issues? Thanks for the help, still learning and trying to improve!