//add back to store button after cart
add_action('woocommerce_single_product_summary', 'themeprefix_back_to_store');
function themeprefix_back_to_store() { ?>
<a class="button wc-backward" href="<?php echo get_permalink( wc_get_page_id( 'shop' ) ); ?>"><?php _e( 'Return to Store', 'woocommerce' ) ?></a>
<?php
}