Adding fresh herbs, dried spices and flavour components (like leeks, onions, carrots, squash, celery, tomatoes, etc.) will certainly make the broth tastier.
You can experiment with different versions, too. Like using spices like roasted ginger, cinnamon, star anise, cardamom, fennel and cloves, to take it into the “pho” direction, or something like fresh dill and dried caraway seed to take it into a russian/germanic direction, or even French Provencal (dried thyme, lavender, bay leaf and fresh basil), or maybe even dreid wild oregano with freshly squeezed lemon juice to take it into the Greek direction.