Shortcode and get_template_part

I am creating my very own plugin for my wordpress. I create a shortcode for my plugin and CPT with a customized taxonomy and customized single-CPT.

When I attempt to use the perform get_template_part() in my shortcode, the result’s a name to a single.php template from the theme. How I can restrict the place get_template_part can search for recordsdata?

That is my shortcode:

perform shortcode_display_products ( $atts ){

 international $wpdb;
 $question = '';

 $atts = shortcode_atts( array(
   'classes' => ''
 ), $atts, 'shortcode_display_products');


if( !empty($atts['categories']) && !is_null($atts['categories']) ){
$question = new WP_Query( array(
  'post_type'     =>  'merchandise',
  'post_status'   => 'public',
  'tax_query' => array(
    array(
      'taxonomy'=> 'teams',
      'discipline'   => 'slug',
      'phrases'   => '"'.$atts['categories'].'"'
    )
  ),
  'showposts'     =>  -1,
  'orderby'       =>  'date',
  'order'         =>  'DESC'
));
}
else{
$question = new WP_Query( array(
  'post_type'   =>  'merchandise',
  'post_status' => 'public',
  'showposts'   =>  -1,
  'orderby'     =>  'date',
  'order'       =>  'DESC'
));
}
ob_start();

if( $query->have_posts() ){

  $c = 0;

  whereas ( $question -> have_posts() ){

      $question -> the_post();
      get_template_part('single','merchandise');

    $c++;
 }
}
else{
 return esc_html__('Not discovered any product register',P_TEXTDOMAIN);
}

wp_reset_postdata();

return ob_get_clean();

}

add_shortcode('display_products','shortcode_display_products');

That is my single-products:

if ( !is_single() ){

 embody '/type/products-form.php';
 $idnumber = ( is_single() )? '': '-'.$c;
?>

<div class="card">
  <div class="card-header" id="heading<?= $idnumber?>">
    <h5 class="mb-0">
      <button class="btn btn-link" data-toggle="collapse" data-target="#collapse<?= $idnumber?>" aria-expanded="true" aria-controls="collapse<?= $idnumber?>">
        <?= $post->title ?>
      </button>
    </h5>
  </div>
  <div id="collapse<?= $idnumber?>" class="collapse present" aria-labelledby="heading<?= $idnumber?>" data-parent="#accordion">
    <div class="card-body">
      <?= $post->content material ?>
      <?php create_product_form() ?>
    </div>
  </div>
</div>

<?php }
else{ _e('nothing else',P_TEXTDOMAIN);}

}