// original source - https://wpsites.net/web-design/change-genesis-widget-title-html-tag-from-h4/
add_filter( 'genesis_register_widget_area_defaults', __NAMESPACE__ . '\change_all_widget_titles_to_p' );

function change_all_widget_titles_to_p( $defaults ) {

	$defaults['before_title'] = '<p class="widget-title widgettitle">';
	$defaults['after_title'] = "</p>\n";

	return $defaults;

}