Modify shop header

add_filter( 'get_the_archive_title', function ( $title ) {
    if ( class_exists( 'WooCommerce' ) && is_shop() ) {
        $title = 'Shop';// Change this to anything you like.
    }
    return $title;
});

add_filter( 'get_the_archive_description', function ( $desc ) {
    if ( class_exists( 'WooCommerce' ) && is_shop() ) {
        $desc = '';// Change this to anything to add description.
    }
    return $desc;
});