Add custom post type

Default archive shows only post type if you need show all post types just add follow code to function.php

add_filter(
'pre_get_posts',
function ($query) {
        if (
            $query->is_main_query() &&
            !is_admin() &&
            (is_category() || is_tag())
            && empty($query->query_vars['suppress_filters'])
        ) {
            $posts = array_diff(
                get_post_types(['public' => true]), ['page', 'attachment', 'revision', 'forum', 'reply', 'topic'] /* array of ignored types*/
            );
            $query->set(
                'post_type', $posts
            );
            return $query;
        }
    }
);