Kyabi is the part of life circumstances over which individuals have no direct control -- if you like: it is the wheel of fortune, or the cards tossed onto the table by an unseen hand. Kyabi is not determined by personal choice, though humans do have personal choice that can affect and wield kyabi. Nor is kyabi blind (divine) determination (though many believe that, too, exists in the world in question). Kyabi can be influenced to a degree, though.
Part of the work of healers, in particular, is to work with individuals to help them define and understand their kyabi. The next step is to find ways to help individuals make suitable life choices so that difficult aspects of kyabi have less effect and fortunate aspects lead to personal success and gratification.