One of our problems in Yahadus is how to relate to Hashem, with Whom - with the exception of Nevi'im - humans cannot experience a tangible relationship (for this purpose, one that takes place via one of the five senses).
There are many reasons why one would want to pursue such a relationship. Perhaps most importantly, because our relationships with the other humans (and non-humans) are supposed to be in emulation of our relationships with Hashem.
Kabbalah, with its Sefiriotic system, provides us with tools by which to appreciate our relationships with Hashem - and also with tools by which we can recreate those relationships in our interpersonal interactions.
Kabbalah also deepens our understandings of the roles played by great human figures. Thus, the correlations of the seven lower ("emotional") sefiros to seven great leaders grants us both a more profound understanding of their personalities - and their personalities in turn grant us a more profound understanding of the modes of relationship they each represent.
That's just a conversation-opener...