WordPress navigation wont appear with wp_head

so im building a custom theme and ive got stuck on the navigation

if i use wp_head(); it loads bootstrap and my custom style sheet but not the navigation if i use get_header(); it loads the navigation but not bootstrap or my custom style sheet

here is my functions.php

function register_navwalker(){
    require_once get_template_directory() . '/inc/class-wp-bootstrap-navwalker.php';
}
add_action( 'after_setup_theme', 'register_navwalker' );

function wpbootstrap_enqueue_styles() {
    wp_enqueue_style( 'bootstrap', 'https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css' );
    wp_enqueue_style( 'my-style', get_template_directory_uri() . '/style.css');
    wp_enqueue_script('bootstrap-js', 'https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js', array('jquery'), NULL, true);
}
add_action('wp_enqueue_scripts', 'wpbootstrap_enqueue_styles');

register_nav_menus(
    array(
        'main_menu'='Main Menu',
    )
);

here is my navigation code in header.php

nav class=navbar navbar-expand-md navbar-light bg-light role=navigation
    div class=container
        button class=navbar-toggler type=button data-toggle=collapse data-target=#bs-example-navbar-collapse-1 aria-controls=bs-example-navbar-collapse-1 aria-expanded=false aria-label=?php esc_attr_e( 'Toggle navigation', 'your-theme-slug' ); ?
        span class=navbar-toggler-icon/span
        /button
        a class=navbar-brand href=#Navbar/a
            ?php
            wp_nav_menu( array(
                'theme_location'    = 'main_menu',
                'depth'             = 2,
                'container'         = 'div',
                'container_class'   = 'collapse navbar-collapse',
                'container_id'      = 'bs-example-navbar-collapse-1',
                'menu_class'        = 'nav navbar-nav',
                'fallback_cb'       = 'WP_Bootstrap_Navwalker::fallback',
                'walker'            = new WP_Bootstrap_Navwalker(),
            ) );
            ?
    /div