Trigger a Popup Maker to display on the redirected page once the post views limit is reached.

trigger_popup_maker_with_limit_post_views.php

<?php
/**
 * Trigger a Popup Maker to display on the redirected page once the post views limit is reached.
 * Requires: https://www.paidmembershipspro.com/add-ons/pmpro-limit-post-views/ and https://wordpress.org/plugins/popup-maker/
 */
function trigger_popup_maker_with_limit_post_views() {
	// Check cookie for views value and compare to limit based on visitor/user.
	if ( ! empty( $_COOKIE['pmpro_lpv_count'] ) ) {
		global $current_user;

		// Check cookie for views value.
		$parts = explode( ';', sanitize_text_field( $_COOKIE['pmpro_lpv_count'] ) );
		$limitparts = explode( ',', $parts[0] );

		// Get the level limit for the current user.
		if ( defined( 'PMPRO_LPV_LIMIT' ) && PMPRO_LPV_LIMIT > 0 ) {
			$limit = intval( PMPRO_LPV_LIMIT );

			if ( $limit >= $limitparts[1] ) {
			?>
			<script type="text/javascript">
				jQuery(document).ready(function($) {
					$('#popmake-1').popmake('open');
				});
			</script>
			<?php
			}
		}
	}
}
add_action( 'wp_footer', 'trigger_popup_maker_with_limit_post_views' );

This recipe is included in the blog post on "Improve the user experience (and increase signups) when using the Limit Post Views Add On" at Paid Memberships Pro here: https://www.paidmembershipspro.com/improve-the-user-experience-and-increase-signups-when-using-the-limit-post-views-add-on/