my-change-account-page-text.php

<?php
/**
 * Change the "Choose a membership level" wording on the Paid Memberships Pro account page.
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_account_page_gettext_changes( $translated, $text, $domain ) {
	global $pmpro_pages;

	// Only process on the account page and only for PMPro text
	if ( ! isset( $pmpro_pages ) || empty( $pmpro_pages ) || ! is_page( $pmpro_pages['account'] ) || $domain !== 'paid-memberships-pro' ) {
		return $translated;
	}

	switch ( $domain ) {
		case 'paid-memberships-pro':
			switch ( $text ) {
				case "You do not have an active membership. <a href='%s'>Choose a membership level.</a>";
					$translated = "You do not have an active membership. <a href='%s'>Click here to renew your membership.</a>";
					break;
			}
			break;
	}

	return $translated;
}
add_filter( 'gettext', 'my_pmpro_account_page_gettext_changes', 10, 3 );