Thanks for the feedback! Once you gain the jump skill you can reach at least two new bosses (you can actually do them even without the skill). Have you already fought the Temple Guardian? It's inside the temple, behind the locked door. Or you can go to the Crypt. You have to take the stairs in the far north of the temple. The only section you can't reach without two exploration skills is the one in the left side of the temple (the opposite side of the Storm Shrine).