If you have styling issue then remove previous code and add

onClick="window.location.href='<?php echo fep_query_url( 'viewmessage', [
	'fep_id' => fep_get_the_id(),
	'feppage' => isset( $_GET['feppage'] ) ? $_GET['feppage'] : 1,
	'fep-filter' => isset( $_GET['fep-filter'] ) ? $_GET['fep-filter'] : '',
] ); ?>'"

in that div. Also style that div to show cursor as pointer.