get_the_terms() to show all custom taxonomies

Question

I have created three custom taxonomies that categorize my post types by project-client, project-brand, & project-medium. As of now I can use the get_the_terms() function to return only one taxonomy successfully, project-client.

Is there a way to use get_the_terms() to show taxonomies from all three custom taxonomies or is a different function needed such as get_terms()?

My code as it stands:

<?php
$project_attrs = get_the_terms( $post->ID, 'project-client' );
if (!empty($project_attrs)){ ?>
    <ul class="meta">
        <?php 
        foreach($project_attrs as $attr){
        echo '<li>' . $attr->name . ' ' . '/' . '</li>';
        }    
        ?>
    </ul>
<?php } ?>

The function is successful at displaying my requested taxonomy, just would like to know how to display all taxonomies from multiple custom taxonomies.