new WP_Query messes up pagination

Hi!

I’ve been looking around for a solution to displaying a separate amount of posts specifically for the archive pages, and thought I had came up with some working code, however I see it messes up pagination. Basically page 2 of the archive displays the same posts as the archive front page. Link: https://hvamgolfklubb.no/category/ukategorisert/

Code:

<?php 

				/* Sets the amount of posts to display for $querycat */
				$querycat = new WP_Query( 'posts_per_page=4' ); ?>

			<?php
			/* Start the Loop */
			while ( $querycat->have_posts() ) : $querycat->the_post(); /* Display $querycat amount of posts */

				/* Include the post format-specific template for the content. If you want to
				 * this in a child theme then include a file called called content-___.php
				 * (where ___ is the post format) and that will be used instead.
				 */
				get_template_part( 'content', get_post_format() );

			endwhile;

			wpbeginner_numeric_posts_nav();
			?>

Any help is appreciated. It’s not the numeric pagination that creates the error.