Move the attendee form so it's before the ticket details. Event Espresso 4. Add this to your functions file.

ee_custom_move_attendee_form.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

function ee_custom_move_attendee_form() {
    wp_add_inline_script( 
        'single_page_checkout',
        'jQuery( document ).ready(function($) {
            $(".ee-reg-form-attendee-dv").insertAfter("#spco-attendee_information-pg");
        });'
    );
}
add_action( 'wp_enqueue_scripts', 'ee_custom_move_attendee_form', 11 );