This gist is for a dynamic add more section in js and php. Here I make a dynamic add more section using js and save this value in the database. With it I show the add more sections using php.

Make a add more section using js and php

<div class="text-center">
  <button class="btn btn-success add-more" type="button">Add More Images</button>
  <!--This button will add a new section in the dom using js-->
</div>
//js part:
<script>
   var $ =jQuery.noConflict();
   $(document).ready(function(e){
     var count = <?php echo $php_count; ?>;
     $('.add-more').click(function(){
       var html = '<div class="col-sm-4"><div class="form-input-field img_parent"><input type="hidden" class="img_hidden" name="competetor['+count+'][image]" value="<?php echo plugin_dir_url(__DIR__).'imageplaceholder.png'; ?>" /><div class="input_img"><span class="remove button button-large">X</span><img src="<?php echo plugin_dir_url(__DIR__).'imageplaceholder.png'; ?>" alt="Uploaded Image of Competetor" class="competetor_img img-responsive" style="height:350px; width:450px; object-fit:cover"></div><input type="button" class="btn btn-primary upload_image_src" name="" value="Upload Competetor Image"></div></div>';
       $('#here').append(html);
       count = count + 1;
       return false;
     });
    $("body").on('click','.remove', function() {
      console.log('hel');
        $(this).parents('.col-sm-4').remove();
    });
   });
</script>

//php part:
<?php
  $competetor_data = isset($_POST['competetor']) ? $_POST['competetor'] : array();
  $php_count = 0;
  if(is_array($competetor_data) && count($competetor_data) > 0) {
      for($i = 0; $i < count($competetor_data); $i++){
        printf('<div class="col-sm-4"><div class="form-input-field img_parent"><input type="hidden" class="img_hidden" name="competetor[%1$s][image]" value="%2$s" /><div class="input_img"><span class="remove button button-large">X</span><img src="%2$s" alt="Uploaded Image of Competetor" class="competetor_img img-responsive" style="height:350px; width:450px; object-fit:cover"></div><input type="button" class="btn btn-primary upload_image_src" name="" value="Upload Competetor Image"></div></div>',$php_count,$competetor_data[$i]['image']);
        $php_count = $php_count + 1;
      }
  }
?>