Set the submission limit of a WS Form based on the logged-in member's Membership Level.

my_pmpro_set_submission_limit_by_level.php

<?php
/**
 * Check how many posts a member has submitted to a specific form on page ID '48'.
 * Hide the form if they have reached the submission limit for their Membership Level.
 */
function my_pmpro_submission_limit_hide_ws_form( $content ) {
	// Return early if PMPro is not active or the user is not logged in.
	if ( ! function_exists( 'pmpro_has_membership_access' ) || ! is_user_logged_in() ) {
		return $content;
	}

	// Return if the user does not have access. Let PMPro handle the protection.
	if ( ! pmpro_has_membership_access() ) {
		return $content;
	}

	// Are we on the page for submitting news?
	if ( ! is_page( '48' ) ) {
		return $content;
	}

	// Ok, we are on the page and we have the shortcode. Get current user ID
	$user_id = get_current_user_id();

	// Get the current month and year
	$current_month = date( 'm' );
	$current_year = date( 'Y' );

	// Query for the number of posts the user has authored this month
	global $wpdb;
	$post_count = $wpdb->get_var(
		$wpdb->prepare(
			"SELECT COUNT(*) FROM $wpdb->posts 
				WHERE post_author = %d 
				AND post_type = 'post'
				AND MONTH(post_date) = %d 
				AND YEAR(post_date) = %d",
			$user_id,
			$current_month,
			$current_year
		)
	);

	// Check membership level and set submission limit accordingly
	$submission_limit = 1; // Default limit for membership levels
	if ( pmpro_hasMembershipLevel( 2 ) ) {
		$submission_limit = 5; // Custom limit for level 2
	}

	// Hide form and replace shortcode if the user's post count exceeds the submission limit
	if ( $post_count >= $submission_limit ) {
		// Custom message to display instead of the form
		$custom_message = __('You have reached your submission limit for this month. Please contact support if you need assistance.', 'textdomain');

		// Replace the [ws_form ...] shortcode with the custom message
		$content = preg_replace( '/(\[ws_form[^\]]*\]|<!-- wp:wsf-block\/form-add[^\>]*\/-->)/', $custom_message, $content );
	}

	// Return the updated content.
	return $content;
}
add_filter( 'the_content', 'my_pmpro_submission_limit_hide_ws_form', 5, 2 );