We exist because of certain karmas that we need to work out. Karmas are energies that are concentrated around one point: an individual personality. We need to let go of these energies so that we are free from them. And then, we need to make certain that no more karma accumulates around us.
The best way to work out our karmas is to allow life to put us wherever there is a need for our talents. (Talents are survival skills that nature gave us so we can continue to exist).
And, the best way to avoid acquiring new karmas is to perform all our actions in the spirit of selfless service to all.
These two easy steps are all that is required to eliminate existing karma and to avoid creating new karma.