Variable shortcode

Need a variable shortcode because I’m working with a page-builder (beaver builder) and the position of the colorpalette is at the bottom of the page instead of under the image… so I’m using this:

// Variable colorpalette
function db_colorpalette( $atts, $content = null ) {
	
	$id = get_post_thumbnail_id( $postid );
	echo do_shortcode ('[colorpalettes attachments="' . $id . '"]');
}
add_shortcode('variable', 'db_colorpalette'); 

it works but I’m not sure if this is the correct code… also the colorpalette is now positioned on top of the page…