Custom post pagination

I’m using template part for showing portfolio items. It’s not page template just portfolio.php file and I’m included it with get_template_part(‘portfolio’); to homepage.

Now everything is working good. But I want to use pagination for this section. Here is my code block;

<?php
global $wp_query;
$paged = get_query_var('paged') ? get_query_var('paged') : 1;
$port_args = array(
        'post_type'     => 'portfolio',
        'posts_per_page'  => 3,
        'post_status'     => 'publish',
        'paged'       => $paged
);
$wp_port_query = new WP_Query($port_args);

if( have_posts() ) :
    while ( $wp_port_query->have_posts() ) : $wp_port_query->the_post();
        ?>
        <li class="col-lg-4 col-sm-4 view item <?php $terms = get_the_terms( get_the_ID(), 'portfolio_filter' ); ?><?php if($terms) : foreach ($terms as $term) { echo $term->slug.' '; } endif; ?>">

            <?php the_post_thumbnail("portfolio-image"); ?>

        </li>
        <?php
    endwhile;
endif;

echo '<nav>';
echo  '<div>'.get_next_posts_link('Older', $wp_port_query->max_num_pages).'</div>'; //Older Link using max_num_pages
echo  '<div>'.get_previous_posts_link('Newer', $wp_port_query->max_num_pages).'</div>'; //Newer Link using max_num_pages
echo "</nav>";

wp_reset_query();
?>

When I click the Older pagination button it’s going to ?paged=2 but it’s not working it shows same posts again. If I use the page template and open the themename/page_id=82 directly it’s working. And url looking like this ?page_id=82&paged=2 now I’m thinking I missing page id on section. How can I fix this and work it in homepage template section. If it’s not working how can I add the page_id in get_next_posts_link . It’s looking like this now ?paged=2 and I want to change it like this ?page_id=82&paged=2. Page id is coming automaticly from page. How can I do this?