I've created in the admin editor of my site homepage a Metabox with an input and a textarea fields. The code works great. However my goal is to allow the admin user to duplicate the Metabox with the same fields (of course no value inside) by clicking on a button "Add new".

The concept: the user can add as many sections as he wants in the front end of the site homepage. A section corresponds to a Metabox (title + description).

Here is the code of my Metabox:

add_action( 'add_meta_boxes', 'mysite_home_add_meta_box' );
if ( ! function_exists( 'mysite_home_add_meta_box' ) ) {
    function mysite_home_add_meta_box() {
        add_meta_box( 'additional-page-metabox-options', esc_html__( 'Section 1', 'mysite' ), 'mysite_home_metabox_controls', 'page', 'normal', 'low' );
    }
}

if ( ! function_exists( 'mysite_home_metabox_controls' ) ) {
    function mysite_home_metabox_controls( $post ) {
        $meta = get_post_meta( $post->ID );
        $section_title_home_input_field = ( isset( $meta['section_title_home_input_field'][0] ) && '' !== $meta['section_title_home_input_field'][0] ) ? $meta['section_title_home_input_field'][0] : '';
        $section_descr_home_textarea_field = ( isset( $meta['section_descr_home_textarea_field'][0] ) && '' !== $meta['section_descr_home_textarea_field'][0] ) ? $meta['section_descr_home_textarea_field'][0] : '';
        wp_nonce_field( 'mysite_home_control_meta_box', 'mysite_home_control_meta_box_nonce' );
        ?>
        <div class="post_meta_extras">
            <p>
                <label><?php esc_attr_e( 'Title', 'mysite' ); ?></label>
                <input type="text" name="section_title_home_input_field" value="<?php echo esc_attr( $section_title_home_input_field ); ?>">
            </p>
            <p>
                <label><?php esc_attr_e( 'Description', 'mysite' ); ?></label>
                <textarea type="text" name="section_descr_home_textarea_field" id="" class="widefat" cols="100%" rows="8"><?php echo esc_attr( $section_descr_home_textarea_field ); ?></textarea>
            </p>
        <?php
    }
}

add_action( 'save_post', 'mysite_home_save_metaboxes' );
if ( ! function_exists( 'mysite_home_save_metaboxes' ) ) {
    function mysite_home_1_save_metaboxes( $post_id ) {

        if ( ! isset( $_POST['mysite_home_control_meta_box_nonce'] ) || ! wp_verify_nonce( sanitize_key( $_POST['mysite_home_control_meta_box_nonce'] ), 'mysite_home_control_meta_box' ) ) {
            return $post_id;
        }

        if ( isset( $_POST['post_type'] ) && 'page' === $_POST['post_type'] ) {
            if ( ! current_user_can( 'edit_page', $post_id ) ) {
                return $post_id;
            }
        } else {
            if ( ! current_user_can( 'edit_post', $post_id ) ) {
                return $post_id;
            }
        }

        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
            return $post_id;
        }

        if ( isset( $_POST['section_title_home_input_field'] ) ) { 
            update_post_meta( $post_id, 'section_title_home_input_field', sanitize_text_field( wp_unslash( $_POST['section_title_home_input_field'] ) ) );
        }

        if ( isset( $_POST['section_descr_home_textarea_field'] ) ) {
            update_post_meta( $post_id, 'section_descr_home_textarea_field', $_POST['section_descr_home_textarea_field'] );
        }

    }
}

I'm struggling to find a solution. Any help would be appreciated, thanks!