There are no other ways.
Q: You can’t say there are no other ways except for Kabbalah! It would be more accurate to say that ALL roads lead to the Creator, but Kabbalah is the shortest of them.
A: How can one know that Kabbalah is the shortest way, that it is actually the road leading to the goal?
One travels on the road of Kabbalah relying only on the Kabbalists and on the subconscious sensation of one’s heart. There is no other way. No one is able to see it in advance. The point in our hearts, the aspiration for the Higher World, feels that only Kabbalah can provide the expected answer. You may also choose to trust the Kabbalists who discovered it for themselves and described it for you. It is up to you.