How to use pre_get_posts on archive page custom post type

I'm trying to use pre_get_posts to modify my post display request. The posts I want to display are custom post types. I am in a custom page template.

I have this is my functions.php

function tax_and_offset_homepage( $query ) {
    if ( !is_admin()  $query-is_post_type_archive( array( 'project' ) )  ) {

        $query-set( 'post_type', 'project' ) ;
        if (null!==(get_option('sticky_posts'))){
            $count_sticky = count(get_option('sticky_posts'));
        }
        $ppp = get_option( 'posts_per_page' );
        $offset = $count_sticky;
        if ( !$query-is_paged() ) {
            $query-set( 'posts_per_page', $ppp - $offset );
        } else {
            $offset = ( ( $query-query_vars['paged']-1 ) * $ppp ) - $offset;
            $query-set( 'posts_per_page', $ppp );
            $query-set( 'offset', $offset );
        }

    }
}
add_action('pre_get_posts','tax_and_offset_homepage');

function homepage_offset_pagination( $found_posts, $query ) {

    if (null!==(get_option('sticky_posts'))){
        $count_sticky = count(get_option('sticky_posts'));
    }
    $offset = $count_sticky;

    if( $query-is_post_type_archive( array( 'project' ) ) ) {
            $found_posts = $found_posts + $offset;
    }
    return $found_posts;
}
add_filter( 'found_posts', 'homepage_offset_pagination', 10, 2 );

And in my custom template page :

 $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$params = ['post_type' = 'project', 'order' = 'DESC', 'posts_per_page' = 9, 'paged' = $paged];
$my_query = new WP_Query( $params );
foreach ($children_array as $project) : ?
div
  ?php echo get_the_title($project); ?
/div
?php endforeach; ?

Problem : the code in functions.php has NO EFFECT. how can I act on my request with the pre_get_posts?