The principle of karma is based on progress and development, and the energy we release while performing any action (through emotions, thoughts, intentions, and actions) returns to us. So, does this energy come back in the next birth as well (which we might call destiny or Prarabdha)? And is the coming of this energy determined by the conscious entity or by nature🤨?

The law of Karma is ingrained in nature as part of a vast and complex process through which the soul evolves. But the soul has to finally accept or refuse it. It can either accept the consequences blindly and go through the long mechanical process of Nature. Or it can allow the consequences as a purifying and learning process. Or it can cut the knot by completely stepping out of Nature into the silence of Nirvana through the Yoga appropriate to this goal.  Or it can greatly reduce its impact by taking the Divine Name or even completely annul it by an aspiration to the Divine Grace. Or becoming conscious of certain parts of nature it can offer them for transformation. There are so many possibilities and not just a blind mechanical law of energy transaction. 

Affectionately,

Alok Da