php file add the following code snippet
<?php get_header(); ?>
<?php while ( have_posts() ) : the_post(); ?>
<?php the_title( '<h1>', '</h1>' ); ?>
<?php the_content(); ?>
<?php endwhile; // end of the loop. ?>
<?php
$post = array(
'post_type' => 'post',
'order' => 'ASC',
'post_status' => 'publish'
);
$loop = new WP_Query( $post ); ?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
<?php the_title( '<h1 class="text-center">', '</h1>' ); ?>
<?php the_content(); ?>
<?php endwhile; // end of the loop. ?>
<?php wp_reset_postdata();?>
<?php get_footer(); ?>
it help you to show the all post after the page content