Solution - 1

Try this

if (!wp_next_scheduled('my_task_hook')) {
	wp_schedule_event( time(), 'weekly', 'my_task_hook' );
}
add_action ( 'my_task_hook', 'my_task_function' );

function my_task_function() {
$my_postid = 1;//This is page id or post id
$content_post = get_post($my_postid);
$content = $content_post->post_content;
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
	wp_mail( '<a rel="nofollow" href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="552c3a203038343c3915223d3027307b363a38">[email protected]</a>', 'this is the subject', $content );
}
function my_add_weekly( $schedules ) {
	// add a 'weekly' schedule to the existing set
	$schedules['weekly'] = array(
		'interval' => 604800,
		'display' => __('Once Weekly')
	);
	return $schedules;
}
add_filter( 'cron_schedules', 'my_add_weekly' ); 

Solution - 2

Do you like any plugin which sends email when content of the page is changed ?? If yes then I will tweek it to send you mail every one week automatically.