Please try below code :
<?php get_header(); ?>
<main role="main">
<section class="container">
<div class="row">
<div class="col-lg-8">
<?php if ( have_posts() ) : ?>
<?php while ( have_posts() ) : the_post(); ?>
<h1 class="text-center><?php the_title(); ?></h1>
<?php endwhile; ?>
<?php wp_reset_postdata(); ?>
<?php endif; ?>
<div class="row">
<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array('post_type'=>'post', 'post_status'=>'publish', 'paged'=>$paged );
$post_query = new WP_Query($args); ?>
<?php if ( $post_query->have_posts() ) : ?>
<?php while ( $post_query->have_posts() ) : $post_query->the_post(); ?>
<div class="col-lg-4">
<article class="news-item">
<?php $image = get_the_post_thumbnail_url(get_the_ID(), 'medium'); ?>
<a class="news-img" href="<?php echo get_permalink(); ?>" style="background-image: url(<?php echo esc_url($image); ?>);">
</a>
<div class="news-copy">
<h2 class="news-title"><?php the_title(); ?></h2>
<?php the_excerpt(); ?>
</div>
<div class="news">
<div class="news-date"><?php echo get_the_date( 'd/m/Y' ); ?></div>
<a class="btn" href="<?php echo get_permalink(); ?>">
<?php if (function_exists('pll_e')) { pll_e('More'); } ?>
<i class="ti-angle-right"></i>
</a>
</div>
</article>
</div>
<?php endwhile; ?>
<?php wp_reset_postdata(); ?>
<?php else : ?>
<p><?php if (function_exists('pll_e')) { pll_e('Sorry, xxx...'); } ?></p>
<?php endif; ?>
<?php the_posts_pagination(); ?>
</div>
</div>
</div>
</section>
</main>
<?php get_footer(); ?>