A filter to override the Restrict Content Pro - Resume Manager resume limit and set it to a custom value.

custom_set_limit.php

function custom_set_limit( $at_limit, $user_id ) {

	if ( is_user_logged_in() && ! current_user_can( 'administrator' ) ) {

		if ( empty( $user_id ) ) {
			$user_id = get_current_user_id();
		}

		$resume_args = array(
			'post_type'              => 'resume',
			'posts_per_page'         => 999,
			'post_status'            => array( 'publish', 'pending', 'hidden' ),
			'author'                 => $user_id,
			'update_post_term_cache' => false,
			'update_post_meta_cache' => false,
			'cache_results'          => false,
		);

		$resumes = new WP_Query( $resume_args );

		$count = $resumes->post_count;

		if ( $count >= 1 ) {
			return $at_limit = true;
		}

	}

}
add_filter( 'rcp_rm_is_at_resume_limit', 'custom_set_limit', 2, 10 );