How to use the plugin in the footer?

Hi!
I use the plugin in the footer, so it is outside of the loop. I display the latest posts of some categories there. Unfortunately adding the code-suggestion of the plugin does not work. If I use it like it is described ALL images of those 4 categories are shown, not only the image of the active category.

My code goes like this:

		<?php
$myQuery = new WP_Query('showposts=4&cat=2,7,8,9');
while ($myQuery->have_posts()) : $myQuery->the_post();
?>

<div class="footerteaser">

<div class="footerteaser_bild">
<?php foreach( get_categories(['hide_empty' => false]) as $category) {
    echo do_shortcode(sprintf('[wp_custom_image_category term_id="%s"]',$category->term_id));
} ?>
</div> <!--footerteaser_bild-->

 
<div class="footerteaser_text">
<a href="<?php the_permalink(); ?>" title="Permalink to <?php the_title(); ?>">
        <strong><?php the_title() ?> </strong>
    </a> <br />
    <?php $mycontent=get_the_excerpt(); 
      echo substr($mycontent,0,100);
    ?>
</div><!--footerteaser_text-->    
</div><!--FOOTERTEASER-->
    

    
<?php endwhile; ?>
<?php wp_reset_query(); ?>
</div>

Could you please help me to see my mistake? I suppose the problem is that I am out of the loop.

Thank you!
Raphael